{"id":848,"date":"2014-12-02T22:34:17","date_gmt":"2014-12-02T21:34:17","guid":{"rendered":"http:\/\/www.unimath.fr\/?p=848"},"modified":"2014-12-02T22:46:23","modified_gmt":"2014-12-02T21:46:23","slug":"848","status":"publish","type":"post","link":"http:\/\/www.unimath.fr\/?p=848","title":{"rendered":""},"content":{"rendered":"<p>Soit la fonction <img src='http:\/\/s0.wp.com\/latex.php?latex=f&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='f' title='f' class='latex' \/> d\u00e9finie sur R\u00a0par : <img src='http:\/\/s0.wp.com\/latex.php?latex=f%28x%29+%3D+%281+-+x%29%5Ctext%7Be%7D%5Ex&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='f(x) = (1 - x)\\text{e}^x' title='f(x) = (1 - x)\\text{e}^x' class='latex' \/>.<\/p>\n<ol>\n<li>On note <img src='http:\/\/s0.wp.com\/latex.php?latex=%5Cmathcal%7BC%7D_%7Bf%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='\\mathcal{C}_{f}' title='\\mathcal{C}_{f}' class='latex' \/> la courbe repr\u00e9sentative de <img src='http:\/\/s0.wp.com\/latex.php?latex=f&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='f' title='f' class='latex' \/> dans le plan rapport\u00e9 \u00e0 un rep\u00e8re orthonorm\u00e9 .<\/li>\n<li>Donner les limites de <img src='http:\/\/s0.wp.com\/latex.php?latex=f&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='f' title='f' class='latex' \/> aux bornes de son domaine de d\u00e9finition.<br \/>\nEn d\u00e9duire que $latex\u00a0f $ admet une asymptote <img src='http:\/\/s0.wp.com\/latex.php?latex=%5CDelta&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='\\Delta' title='\\Delta' class='latex' \/> au voisinage de <img src='http:\/\/s0.wp.com\/latex.php?latex=-+%5Cinfty&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='- \\infty' title='- \\infty' class='latex' \/> dont on donnera une \u00e9quation.<\/li>\n<li>D\u00e9terminer <img src='http:\/\/s0.wp.com\/latex.php?latex=f%27%28x%29&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='f&#039;(x)' title='f&#039;(x)' class='latex' \/><br \/>\nDonner le tableau des variations de <img src='http:\/\/s0.wp.com\/latex.php?latex=f&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='f' title='f' class='latex' \/>.<br \/>\nD\u00e9terminer une \u00e9quation de la tangente <img src='http:\/\/s0.wp.com\/latex.php?latex=T_%7B1%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='T_{1}' title='T_{1}' class='latex' \/> au point A d&rsquo;abscisse 1 de la courbe <img src='http:\/\/s0.wp.com\/latex.php?latex=%5Cmathcal%7BC%7D_%7Bf%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='\\mathcal{C}_{f}' title='\\mathcal{C}_{f}' class='latex' \/> et une<br \/>\n\u00e9quation de la tangente <img src='http:\/\/s0.wp.com\/latex.php?latex=T_%7B-1%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='T_{-1}' title='T_{-1}' class='latex' \/> au point B d&rsquo;abscisse -1.<br \/>\nExpliquer pourquoi l&rsquo;on peut affirmer que les tangentes <img src='http:\/\/s0.wp.com\/latex.php?latex=T_%7B1%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='T_{1}' title='T_{1}' class='latex' \/> et \u00a0<img src='http:\/\/s0.wp.com\/latex.php?latex=T_%7B-1%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='T_{-1}' title='T_{-1}' class='latex' \/>\u00a0sont perpendiculaires.<\/li>\n<li>On se propose d&rsquo;\u00e9tudier la position de <img src='http:\/\/s0.wp.com\/latex.php?latex=%5Cmathcal%7BC%7D_%7Bf%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='\\mathcal{C}_{f}' title='\\mathcal{C}_{f}' class='latex' \/> par rapport \u00e0 <img src='http:\/\/s0.wp.com\/latex.php?latex=T_%7B-1%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='T_{-1}' title='T_{-1}' class='latex' \/>.<\/li>\n<li>Pour cela, on consid\u00e8re la fonction <img src='http:\/\/s0.wp.com\/latex.php?latex=g&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g' title='g' class='latex' \/> d\u00e9finie sur R\u00a0par :<br \/>\n<img src='http:\/\/s0.wp.com\/latex.php?latex=g%28x%29+%3D+%281+-+x%29%5Ctext%7Be%7D%5Ex+-+%5Cleft%28%5Cdfrac%7Bx+%2B+3%7D%7B%5Ctext%7Be%7D%7D%5Cright%29&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g(x) = (1 - x)\\text{e}^x - \\left(\\dfrac{x + 3}{\\text{e}}\\right)' title='g(x) = (1 - x)\\text{e}^x - \\left(\\dfrac{x + 3}{\\text{e}}\\right)' class='latex' \/><\/li>\n<li>D\u00e9terminer <img src='http:\/\/s0.wp.com\/latex.php?latex=g%27%28x%29&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g&#039;(x)' title='g&#039;(x)' class='latex' \/> et\u00a0<img src='http:\/\/s0.wp.com\/latex.php?latex=g%C2+%C2%BB%28x%29&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='' title='' class='latex' \/> o\u00f9 \u00a0g&rsquo; et \u00a0g\u00a0\u00bb sont les d\u00e9riv\u00e9es premi\u00e8re et seconde de <img src='http:\/\/s0.wp.com\/latex.php?latex=g&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g' title='g' class='latex' \/>.<br \/>\n\u00c9tudier le signe de $latex\u00a0g$ et le sens de variation de <img src='http:\/\/s0.wp.com\/latex.php?latex=g%26rsquo%3B&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g&rsquo;' title='g&rsquo;' class='latex' \/>. Pr\u00e9ciser la valeur de <img src='http:\/\/s0.wp.com\/latex.php?latex=g%27%28-1%29&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g&#039;(-1)' title='g&#039;(-1)' class='latex' \/>.<\/li>\n<li>\u00c9tudier le signe de <img src='http:\/\/s0.wp.com\/latex.php?latex=g%26rsquo%3B+&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g&rsquo; ' title='g&rsquo; ' class='latex' \/> et le sens de variation de <img src='http:\/\/s0.wp.com\/latex.php?latex=g&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g' title='g' class='latex' \/>. Pr\u00e9ciser la valeur de <img src='http:\/\/s0.wp.com\/latex.php?latex=g%28-1%29&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g(-1)' title='g(-1)' class='latex' \/>.<\/li>\n<li>Enfin donner le signe de <img src='http:\/\/s0.wp.com\/latex.php?latex=g&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='g' title='g' class='latex' \/>.<br \/>\nIndiquer alors la position de la courbe <img src='http:\/\/s0.wp.com\/latex.php?latex=%5Cmathcal%7BC%7D_%7Bf%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='\\mathcal{C}_{f}' title='\\mathcal{C}_{f}' class='latex' \/> par rapport \u00e0 la tangente <img src='http:\/\/s0.wp.com\/latex.php?latex=T_%7B-1%7D&#038;bg=ffffff&#038;fg=000000&#038;s=0' alt='T_{-1}' title='T_{-1}' class='latex' \/>.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Soit la fonction d\u00e9finie sur R\u00a0par : . On note la courbe repr\u00e9sentative de dans le plan rapport\u00e9 \u00e0 un rep\u00e8re orthonorm\u00e9 . Donner les limites de aux bornes de son domaine de d\u00e9finition. En d\u00e9duire que $latex\u00a0f $ admet une asymptote au voisinage de dont on donnera une \u00e9quation. D\u00e9terminer Donner le tableau des [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/www.unimath.fr\/index.php?rest_route=\/wp\/v2\/posts\/848"}],"collection":[{"href":"http:\/\/www.unimath.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.unimath.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.unimath.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.unimath.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=848"}],"version-history":[{"count":8,"href":"http:\/\/www.unimath.fr\/index.php?rest_route=\/wp\/v2\/posts\/848\/revisions"}],"predecessor-version":[{"id":860,"href":"http:\/\/www.unimath.fr\/index.php?rest_route=\/wp\/v2\/posts\/848\/revisions\/860"}],"wp:attachment":[{"href":"http:\/\/www.unimath.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.unimath.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=848"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.unimath.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}