∫dx/(sinxcosx) = ∫2dx/sin2x
= ∫csc2xd2x = ln|csc2x-cot2x| + C
∫(sinx)^3dx = -∫(sinx)^2dcosx
= -∫[1-(cosx)^2]dcosx
= -cosx + (1/3)(cosx)^3 + C
1 ∫dx/(sinxcosx) = ∫2dx/sin2x
= ∫csc2xd2x = -ln|csc2x+cot2x| + C
∫(sinx)^3dx = -∫(sinx)^2dcosx
= -∫[1-(cosx)^2]dcosx
= (1/3)(cosx)^3-cosx + C
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