极坐标方程求导：r=sin3t在t=π/3处的切线方程
<p>问题：极坐标方程求导：r=sin3t在t=π/3处的切线方程<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">唐莺的回答：<div class="content-b">网友采纳 r=sin3t=sin(t+2t)=sintcos2t+costsin2t=sint(cost)^2-(sint)^3+2sint(cost)^2=3sint(cost)^2-(sint)^3r^4=3rsint(rcost)^2-(rsint)^3(x^2+y^2)^2=3yx^2-y^3x^4+4y^2x^2-3yx^2+y^3+y^4=0
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