`sqrt((1-cos A)/(1+cos A))+sqrt((1+cos A)/(1-cos A))=2cosec A`

tan ""A/2 is equal to.............. A) sqrt((1- sin A)/( 1+ sin A)) B) sqrt((1+ sin A)/(1- sin A)) C) sqrt((1 -cos A)/(1 + cos A)) D) sqrt((1 +cos A)/(1- cos A))

sqrt ((1-cos A) / (1 + cos A)) = cos ecA-cot A

sqrt ((1-cos A) / (1 + cos A)) = (sin A) / (1 + cos A)

tan(A/2)=(sqrt((1-cos A)/(1+cos A)))

cos(A/2)=+-sqrt((1+cos A)/(2))

Prove that: sqrt ((1 + cos A) / (1-cos A)) = cos ecA + cot A

If pi

Find the value of sqrt((1+cos theta)/(1-cos theta))+sqrt((1-cos theta)/(1+cos theta))

Prove that: (i)tan^(-1){(sqrt(1+cos x)+sqrt(1-cos x))/(sqrt(1+cos x)-sqrt(1-cos x))}=(pi)/(4)+(x)/(2)

Prove that: tan^(^^)(-1){(sqrt(1+cos x)+sqrt(1-cos x))/(sqrt(1+cos x)-sqrt(1-cos x))}=pi/4-x/2, if pi