Evaluate ddx[sin(x)cos(x)]\frac{d}{dx} \left[ \frac{\sin(x)}{\cos(x)} \right]dxd[cos(x)sin(x)].
cos2(x)\cos^2(x)cos2(x)
sec2(x)\sec^2(x)sec2(x)
111
tan(x)\tan(x)tan(x)