1) Prove that 1/secA-tanA=secA+tanA
2) cosA/ cosecA + cosA/ cosecA = 2
3)1/ 1-sinA + 1/ 1+sinA = 2sec^2 A
4)sec^2A + cosec^2A = sec^2A × cosec^2A
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1)1/secA-tanA ×secA+tanA/secA+tanA
= secA+tanA/sec^2-tan^2
secA+tanA. (sec^2A-tan^2A= 1)
3) 1/1-sinA +1/1+sinA
=1+sinA+1-sinA / 1-sin^2A = 2sec^2A
= secA+tanA/sec^2-tan^2
secA+tanA. (sec^2A-tan^2A= 1)
3) 1/1-sinA +1/1+sinA
=1+sinA+1-sinA / 1-sin^2A = 2sec^2A
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