∫(e^t)[(sint)^3]dx

∫(e^t)[(sint)^3]dx x=(e^t)sint y=(e^t)cost 求d^2y/dx^2 d/dx∫(sint/t)dt上限π下限x 求微分的题目一道,x=e^(-t)sint,y=e^tcost,求 d^2y/dx^2 设x=1+t^2、y=cost 求 dy/dx 和d^2y/dx^2 sint-tcost/4t^3 和 sint-tc 求(d/dx)∫(sint/t)dt=?上限为x 下限为0 验证参数方程{x=e^t*sint y=e^t*cost 所确定的函数满足关系式(d^2y/dx^2)*(x+y)^2= 求解一道曲线积分的题∫c (y+sinx)dx + (z^2+cosy)dy +x^3dzc是曲线 r(t)=sint f(x)=∫（x^2,1）sint/t dt,求∫(1,0)xf(x)dx f(x)=∫[0,x] sint/(3.14-t) dt,求∫[0,3.14]f(x)dx d/dx[∫(上限x^3 下限0 )sint^2dt]=? L为参数方程x=cost+tsint y=sint-tcost 求曲线积分x+e^xdy+（y+ye^x）dx t为0到