Math, asked by Rumaaan, 11 months ago

(1+cosA)(1-cosA)=3/4, find cos A

Answers

Answered by rits1178

0

(1+cosA)(1-cosA)=3/4

(1-cos^2A)=3/4

1-3/4=cos^2A

4-3/4=cos^2A

1/4=cos^2A

cosA=√1/4

cosA=1/2

cosA=cos60°

A=60°

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