Question

$intlimits sin (3x+ frac{ pi }{4}) , dx$

Answer 1

$intlimits {sin(3x+ pi /4)} , dx= frac{1}{3} intlimits {sin(3x+ pi /4)} , d(3x+ pi /4)= \= -frac{1}{3}cos(3x+ pi /4)+C$