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If t a ntheta/2=sqrt((1-e)/(1+e))tanalph...

If `t a ntheta/2=sqrt((1-e)/(1+e))tanalpha/2,t h e ncosalpha=` `1-ecos(costheta+e)` (b) `(1+ecostheta)/(costheta-e)` (c) `(1-ecostheta)/(costheta-e)` (d) `(costheta-e)/(1-ecostheta)`

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If t a ntheta/2=sqrt((1-e)/(1+e))tan(alpha/2) , then cosalpha= (a) 1-ecos(costheta+e) (b) (1+ecostheta)/(costheta-e) (c) (1-ecostheta)/(costheta-e) (d) (costheta-e)/(1-ecostheta)

(sintheta)/(1+costheta) is equal to (a) (1+costheta)/(sintheta) (b) (1-costheta)/(costheta) (c) (1-costheta)/(sintheta) (d) (1-sintheta)/(costheta)

Prove that sqrt((1+costheta)/(1-costheta))+sqrt((1-costheta)/(1+costheta))=2cosectheta

Prove: ((1+sintheta-costheta)/(1+sintheta+costheta))^2=(1-costheta)/(1+costheta)

Prove: (costheta)/(cos e c\ theta+1)+(costheta)/(cos e c\ theta-1)=2tantheta

Prove: (sintheta)/(1-costheta)=cos e c\ theta+cottheta

(sintheta)/(1-cottheta)+(costheta)/(1-tantheta) is equal to (a) 0 (b) 1 (c) sintheta+costheta (d) sintheta-costheta

Prove that: sqrt((1+costheta)/(1-costheta))=cos e ctheta+cottheta .

Prove the following identities: (1-costheta)/(1+costheta)=(cos e ctheta-cottheta)^2

Prove the trigonometric identities: sqrt((1-costheta)/(1+costheta))=cos e ctheta-cottheta