Question

a man's age after 15 years will be the square of his age is 15 years ago. What is his present age?​

Answer 1

$\huge\displaystyle \sf \red{\int \limits^{ \frac{ \pi}{2} }_{0} \frac{3 \sqrt{ \cos \theta} }{( \sqrt{cos \theta} + \sqrt{sin \: \theta}) {}^{5} } \: d \theta}$

Answer 2

$\huge\displaystyle \sf \red{\int \limits^{ \frac{ \pi}{2} }_{0} \frac{3 \sqrt{ \cos \theta} }{( \sqrt{cos \theta} + \sqrt{sin \: \theta}) {}^{5} } \: d \theta}$