" 25."(1)/(1-cos A)+(1)/(1+cos A)=2cosec^(2)A

Prove the following identities : (1)/ (1 + cos A) + (1)/ (1 - cos A) = 2 cosec^(2) A

Prove that (sin A)/(1 + cos A) + (sin A)/(1 - cos A) = 2 cosec A.

Find the value of (1+cos A)(1-cos A)cosec^(2)A .

Prove that : (1)/ (1 + cos (90^(@) - A)) + (1)/ (1 - cos (90^(@) - A)) = 2 cosec^(2) (90^(@) - A)

(1)/(1-cos theta)-(1)/(1+cos theta)=(2cos theta)/(sin^(2)theta)=2cot theta xx csc

Prove the following identities : sqrt ((1 - cos A) /(1 + cos A)) = cosec A - cot A

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

Prove that : (1 + cos A)/(1 - cos A) = (cosec A + cot A)^(2)

Prove that : (1+ cos A)/(sinA) + (sin A)/(1+ cos A) = 2 "cosec " A

Show that (1)/( 1 + cos (90^(@) - theta)) + (1)/(1 - cos (90^(@) - theta )) = 2 cosec ^(2) (90 ^(@) - theta )