Question

(sin⁴A+cos⁴A)/1-2sin²A*cos²A = 1

Answer 1

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(cos²A + sin²A)² = 1²


<=> (cos²A)² + 2 cos²A

sin²A + (sin²A)² = 1


<=> cos⁴A + 2 sin²A cos²A + sin⁴A = 1


<=> cos⁴A + sin⁴A = 1 - 2 sin²A cos²A.



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