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" 21."(1+tan^(2)theta)(1-sin theta)(1+si...

" 21."(1+tan^(2)theta)(1-sin theta)(1+sin theta)=1

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Prove the identities: (1+tan^(2)theta)(1-sin theta)(1+sin theta)=1

Show :(1+tan^(2)theta)(1+sin theta)(1-sin theta)=1

Prove: (1 + tan^2 theta)(1+sin theta)(1-sin theta) = 1

Prove the identities : (1+tan^2 theta) (1-sin theta) (1+sin theta) =1

Prove : ( 1+ tan^2 theta )(1 + sin theta )(1 - sin theta) = 1 .

(iii) ( 1 + tan^2 theta ) ( 1 + sin theta ) ( 1 - sin theta ) =1

Prove that (1+sin theta)/(1-sin theta)-(1-sin theta)/(1+sin theta)=4sec theta tan theta

Prove that (1+tan theta)/(1-tan theta) = (1 - sin 2 theta)/(cos 2 theta) .

Prove that (1+sin2 theta)/(1-sin2 theta)=((1+tan theta)/(1-tan theta))^(2)