Question

process of this sum?

Answer 1

$= \frac{ \ \sec ^{2} \alpha - { \tan^{2} \alpha } }{2( { \cos^{2} 48 } + \sin^{2} 48) } + \frac{2 \tan^{2} 30 \frac{1}{ \cos^{2} 52 } \sin^{2} 38 } { \sec^{2} 20 - \tan^{2} 20 } \\ = \frac{1}{2(1)} + 2( \frac{ \frac{1}{ \sqrt{3} } }{1}) \\ = \frac{ \sqrt{3} + 4}{2 \sqrt{3} }$