Math, asked by rishon22ashish, 1 year ago

Find the value of ( sin 72 + cos 18) ( sin 72 – cos 18)

Answers

Answered by ramiz50

4

Answer:

(sin(90-18) + cos18)(sin(90-18) + cos18)

=(cos18+cos18)(cos18 +cos18)

=4cos^218

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