7. If $\int \sin x ^ { 1 } t ^ { 2 } f ( t ) d t = 1 - \sin x \forall x \hat { I } [ 0 , \Pi / 2 ]$ then $f ( 1 / \sqrt { } 3 )$ is: (a) 3 (b) $\sqrt { } 3$ (c) $1 / 3$ (d) none of these
Which of the following relationships is true in every triangle $A B C$ ?
7. If $\int \sin x ^ { 1 } t ^ { 2 } f ( t ) d t = 1 - \sin x \forall x \hat { I } [ 0 , \Pi / 2 ]$ then $f ( 1 / \sqrt { } 3 )$ is:\\
(a) 3\\
(b) $\sqrt { } 3$\\
(c) $1 / 3$\\
(d) none of these\\