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[" 50."(tan A)/(1+sec A)-(tan A)/(1-sec ...

[" 50."(tan A)/(1+sec A)-(tan A)/(1-sec A),=2cosec A],[," INCERT EXEMPLAR] "]

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Prove that (tan A)/(sec A-1)+(tan A)/(sec A+1)=2 cosec A .

(1)/(sec A-tan A)=sec A+tan A

(1)/(sec A-tan A)=sec A+tan A

(tan A+cot A)=(sec A*csc A)

" (i) "(1+sec A+tan A)(1-cosec A+cot A)=2

Prove that (tan A)/(sec A -1) + (tan A)/(sec A +1) = 2 cosec A

(1+tan A+sec A)(1+cot A-cosec A)=

(1+tan A)/(sin A)+(1+cot A)/(cos A)=2(sec A+cosec A)