(sinA+cosecA²) +(cosA+secA) ²=7+tan²A+cot²A
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LHS = (sin A + cosec A)2 + (cos A+ sec A)2
= (sin2 A + 2 sin A . cosec A + cosec2 A) + (cos2 A + 2 cos A . sec A + sec2A)
= sin2 A + 2 + cosec2 A + cos2 A + 2 + sec2 A ---(sin A . cosec A =1=cos A . sec A)
= sin2 A + 2 + 1 + cot2 A + cos2 A + 2 + 1 + tan2 A ---(cosec2 A=1+ cot2 A & sec2 A=1+tan2 A)
= ( sin2 A + cos2 A ) + 6 + ( cot2 A + tan2 A )
= 1 + 6 + cot2 A + tan2 A-----(sin2 A + cos2 A =1)
= 7 + tan2 A + cot2
= RHS
= (sin2 A + 2 sin A . cosec A + cosec2 A) + (cos2 A + 2 cos A . sec A + sec2A)
= sin2 A + 2 + cosec2 A + cos2 A + 2 + sec2 A ---(sin A . cosec A =1=cos A . sec A)
= sin2 A + 2 + 1 + cot2 A + cos2 A + 2 + 1 + tan2 A ---(cosec2 A=1+ cot2 A & sec2 A=1+tan2 A)
= ( sin2 A + cos2 A ) + 6 + ( cot2 A + tan2 A )
= 1 + 6 + cot2 A + tan2 A-----(sin2 A + cos2 A =1)
= 7 + tan2 A + cot2
= RHS
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