Statement-I : The value of integral  $\underset{\pi /6}{\overset{\frac{\pi }{2}}{\int }}\frac{dx}{1+\sqrt{\tan x}}isequalto\frac{\pi }{12}$
Statement-II :  $\underset{a}{\overset{b}{\int }}f\left(x\right)dx=\underset{a}{\overset{b}{\int }}f(a+b-x)dx$

Statement-I is true; statement –II is true; statement-II is a correct explanation for statement-I

Statement-I is true; statement –II is true; statement-II is a not a correct explanation for statement-I

Statement-I is true; statement-I false

Statement-I is false; statement-II is true