Question

prove the following:-

sin⁴A + cos⁴A = 2 sin²A -1
( step by step)​

Answer 1

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(sin²a - cos²a)² + 2sin²acos²a = sin⁴a - 2sin²acos²a + cos⁴a + 2sin²acos²a

(sin²a - cos²a)² + 2sin²acos²a = sin⁴a - 2sin²acos²a + cos⁴a + 2sin²acos²a = sin⁴a + cos⁴a

Step-by-step explanation:

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