Integral (cosx) ^ 2 / (SiNx) ^ 2

Integral (cosx) ^ 2 / (SiNx) ^ 2

Let t = TaNx, then x = arctant, DX = DT / (1 + T & sup2;) ∫ (cosx) ^ 2 / (SiNx) ^ 2DX = ∫ DT / [T & sup2; (T & sup2; + 1)] = ∫ [1 / T & sup2; - 1 / (T & sup2; + 1)] DT = - 1 / t-arctant + C