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[" (i) "(1+sin A)/(sin A)+(1+con)/(cos A...

[" (i) "(1+sin A)/(sin A)+(1+con)/(cos A)=2(sec A+cosec],[" (ii) "sec^(4)A-tan^(4)A=1+2tan^(2)A" ."]

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

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

Prove: sec^(4)A(1-sin^(4)A)-2tan^(2)A=1

7. (sin A+cos A)(cot A+tan A)=sec A+cosec A

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

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

sec ^ (4) A (1-sin ^ (4) A) -2tan ^ (2) A = 1

Prove: sec^4A(1-sin^4A)-2tan^2A=1

Prove: sec^4A(1-sin^4A)-2tan^2A=1

Prove that: sec^4A(1-sin^4A) -2 tan^2A=1 .