Math, asked by sivin30, 5 months ago

If theta-45°, prove that
Cos 2theta = 2cos²theta - 1

Answers

Answered by rajputsachin409

1

Step-by-step explanation:

cos 2*45=2*cos^2(45)-1

cos90 = 2* (1/1.414)^2 -1

0 = 1-1

0=0

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