Question

( frac{1-cos 4 alpha}{sec ^{2} 2 alpha-1}+frac{1+cos 4 alpha}{operatorname{cosec}^{2} 2 alpha-1} )
( 1-cos u alpha=2 sin ^{2} theta alpha )
( 1+cos 4 x=2 cos ^{2} 2 x )
( frac{2 sin ^{2} 2 alpha}{sec ^{2} 2 alpha-1}+frac{2 cos ^{2} 2 alpha}{operatorname{cosec}^{2} 2 alpha-1} )
( Rightarrow quad 2 sin ^{2} 2 alpha operatorname{cosec}^{2} 2 alpha-2 sin ^{2} 2 alpha+2 cos ^{2} 2 alpha sec ^{2} alpha )
( -2 cos ^{2} 2 alpha )
( left(sec ^{2} 2 alpha-1right)left(operatorname{cosec}^{2} 2 alpha-1right) )
( Rightarrow frac{4-2 sin ^{2} 2 alpha-2 cos ^{2} 2 alpha}{tan ^{2} 2 alpha cdot cot ^{2} 2 alpha}left[begin{array}{c}0.0 sec ^{2} 2 alpha-1 =tan ^{2} alphaend{array}right. )
( =4-2 operatorname{csin}^{2} 2 alpha+cos ^{2} 2 alpha )
( =cot ^{2} 2 x )
( =4-2=2 )

# Q.17 is equal to - 1 - cos 4a 1+cos 4a sec? 2a -1 cosec? 2a -1 (A) 0 (B) 2 (C)1 (D) 4 Conditional Tria identiti.

Solution