if 0<x<90 so what is cotx/sinx.cosx
cotx/sinx.cosx
$$cotx\div sinx\times cosx\\\\ =\frac{cosx}{sinx}\div sinx\times cosx\\\\ =\frac{cosx}{sinx}\times \frac{1}{sinx}\times cosx\\\\ =\frac{cos^2x}{sin^2x}\\\\ =Cot^2x$$
