Math, asked by jotrandhawa2462, 1 year ago

Cos 90°=1-2 sin² 45°=2cos² 45°-1



Answers

Answered by Manuchandu
2

cos2A=1-2sin²A=2cos²A-1

cos90=>cos2(45)

cos2(45)=1-2sin²45

=2cos²45-1

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