Prove that (sinA+ cosec A)^2 + (cosA+ secA)2 = 7 + tan^2A+ cot^2A
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Step-by-step explanation:
Using (a+b)² = a²+b²+2ab
sin²A + cosec²A + 2sinAcosecA + cos²A + sec²A + 2cosAsecA
(Rearranging)
sin²A + cos²A + cosec²A + sec²A + 2sinAcosecA + 2cosAsecA
Using sin²A+cos²A = 1, cosec²A = 1+cot²A and sec²A = 1+tan²A
1 + 1 + cot²A + 1 + tan²A + 2sinA×1/sinA + 2cosA×1/cosA
3 + tan²A + cot²A + 2 + 2
7 + tan²A + cot²A
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