Science:Math Exam Resources/Courses/MATH101/April 2017/Question 05 (a)/Hint 2

(For the alternative solution) Use integration by parts, using $f^{\prime }(x)=\sin x$. Use the trig identity $\cos ^{2}x=1-\sin ^{2}x$ to have an expression with only powers of the sine function move all the terms with the highest power to the same side. repeat the process until you get an easy integral you can solve.