" 18."{(sin A)/((1+cos A))+(tan A)/((1-cos 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))

Prove that : (tan A + (1)/ (cos A))^(2) + (tan A - (1)/ (cos A))^(2) = 2 ((1 + sin^(2) A)/ (1 - sin^(2) A))

If tan A=(x sin B)/(1-cos B)tan B=(y sin A)/(1-y cos A) then (x)/(y)=

Prove that : (cos A)/ (1 - tan A) + (sin A)/ (1- cot A) = sin A + cos A

Prove that : (cos A)/ (1 - tan A) + (sin A)/ (1 - cot A) = cos A + sin A

Prove that (cos A)/(1-tan A) + (sin A)/(1-cot A) = cos + sin A .

(cos2A) / (1-sin2A) = (1 + tan A) / (1-tan A)

(cos A) / (1-tan A) + (sin A) / (1-cot A) = sin A + cos A

Show that (cos A)/(1-tan A)+(sin A)/(1-cot A)=sin A +cos A

Show that (i) sin^(8)A-cos^(8)A=(sin^(2)A-cos^(2)A)(1-2sin^(2)A.cos^(2)A) (ii) (1)/(sec A-tan A)-(1)/(cos A)=(1)/(cos A)-(1)/(sec A + tan A)