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

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

The value of lim_(x rarr0)(1)/(x^(2))sqrt((1-cos2x)/(1+cos2x))sqrt((1-cos x)/(1+cos x)) is equal to

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

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

(v) tan^(-1)sqrt((1+cos x)/(1-cos x))

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

tan^(-1){(sqrt(1+cos x)+sqrt(1-cos x))/(sqrt(1+cos x)-sqrt(1-cos x))}

Show that, sqrt((1-"cos"A)/(1+"cos"A))=("sin"A)/(1+"cos"A)

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)