cos 3 A is equal to: - Quantitative Aptitude MCQ SSC CGL 2026 | ExamTest.live

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cos 3 A is equal to:

Solution & Step-by-step Explanation

We know the standard triple-angle formula for cosine: cos3A=4cos 3 A-3cosA Rearranging the terms to express it in terms of cos 3 A: 4cos 3 A=cos3A+3cosA cos 3 A= 4 cos3A+3cosA ​

Try it yourself before checking the explanation above.

cos 3 A is equal to:

A

4 cos3A-3cosA ​

B

3 cos3A+3cosA ​

C

4 cos3A+3cosA ​

D

3 cos3A-3cosA ​

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