cos(log(x))微积分的解法想要解的步骤

cos(log(x))=-sin(log(x))*dlog(x)/dx
=-sin(log(x))/X

微分还是积分?

如果微分的话， 那么楼上正解
Let u = ln (x)
du/dx = 1/x
dy/du = -sin (u)
代入 u = ln (x)
那么
dy/dx = dy/du * du/dx = 1/x * - sin (ln(x))
所以答案就是
-sin (ln(x))/x