Math, asked by Blastgamer, 1 month ago

Prove that sin⁴ A - cos⁴A = 2sin² A - 1.​

Answers

Answered by VishalD84
1

Answer:

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Step-by-step explanation:

(sin²a+cos²a)(sin²a-cos²a)

sin²a+cos²a=1

1(sin²a-cos²a)

sin²a-(1-sin²a). (cos²a=1-sin²a)

sin²a-1+sin²a

=>2sin²a-1

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