Math, asked by pravesh91, 1 year ago

give me the solution of cos^3 a​

Answers

Answered by bhumipreet
0
cos 3A

= cos (2A + A)

= cos 2A cos A - sin 2A sin A

= (2 cos^2 A - 1) cos A - 2 sin A cos A ∙ sin A

= 2 cos^3 A - cos A - 2 cos A (1 - cos^2 A)

= 2 cos^3 A - cos A - 2 cos A + 2 cos^3 A

= 4 cos^3 A - 3 cos A

Therefore,  cos 3A = 4 cos^3 A - 3 cos A   



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pravesh91: I asked cos^3 a, not cos3a
bhumipreet: ok
Answered by adityaaryaas
1

Answer:

Please find the attached image.

Step-by-step explanation:

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adityaaryaas: Welcome brother (^_^)
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