. 64 3 y If the substitution y = " is made, the integral dy will 3+ Vy become 64 1 3+x2 O 2 3+ 12 O 64 1878 3+ 12 O 1818 3+12If x sin ade = -r'COS 1 + 3x-sino + 61 cosx -6/ then f(x) = sin I COST O I Sin c O I COST