prove that (sinA + cosecA)2 + (cosA + secA)2 = 7 + tan2A + cot2A
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(sin2 + 2sincosec + cosec2) + (cos2 + 2cossec + sec2)
sin2 + 2 + cosec2 + cos2 + 2 + sec2
1 +2+2+cosec2+sec2
5+1+cot2 + 1+tan2
7+tan2 + cot2 (proved)
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