prove that sec square theta +cot square(90-0)=2cosec square(90-0)-1
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L. H. S. =
Sec^2 A+cot^2(90-A)
= sec^2A+tan^2A
=1+tan^2A+tan^2A
=1+2tan^2A
R. H. S. =
2cosec^2(90-A) -1
=2sec^2A-1
=2+2tan^2A-1
=1+2tan^2A
Sec^2 A+cot^2(90-A)
= sec^2A+tan^2A
=1+tan^2A+tan^2A
=1+2tan^2A
R. H. S. =
2cosec^2(90-A) -1
=2sec^2A-1
=2+2tan^2A-1
=1+2tan^2A
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