Math, asked by chhavigrewal15, 9 months ago

If A= 60° , Verify that Cos3A = 4Cos3A – 3cosA

Answers

Answered by itzadu29
2

Step-by-step explanation:

Here, A=60°

Cos3A=Cos180°=-1

again,

4cos^3A-3cosA=4×1/8-3×1/2=1/2-3/2=-1

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