sec^2A.cos^2A=tan^2A+cot^2A+2
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tan^2A + cot^2A + 2
(sin^2A/cos ^2A) + (cos^2A/sin^2A) + 2
(sin^4A + cos^4A + 2 sin^2A.cos^2A)/ sin^2A.cos ^2A
(sin^2 + cos ^2A )^2/sin^2A.cos^2A
1/sin^2A.cos^2A
cosec^2A.sin^2A
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