Math, asked by badshah4251, 11 months ago

2 cos2 30°-1=1-2sin2 30°=cos60°

Answers

Answered by trixy123
1

Step-by-step explanation:

2\cos^2 30-1\\=2\cos^2 30-\cos^230-\sin^230\\=\cos^230-\sin^230\\=\cos^2 30 +\sin^2 30-2\sin^2 30\\=1-2\sin^230\\=1-2(1/2)^2\\=1-1/2\\=1/2\\=\cos 60

Hence Proved.

<Hope this helps m8>

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