Math, asked by sohammhatre4358, 9 months ago

cos^4a plz give me answer fast.

Answers

Answered by virendrakumar987319

1

Answer:

cos 4A = cos (2 ∙ 2A) = 2 cos2 (2A) - 1

⇒ cos 4A = 2(2 cos 2A - 1)2 - 1

⇒ cos 4A = 2(4 cos4 A - 4 cos2 A + 1) - 1

⇒ cos 4A = 8 cos4 A – 8 cos2 A + 1

Step-by-step explanation:

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