Math, asked by Dhrupad12, 1 year ago

prove that cos 30 degree ×Cos 60 degree + sin 30 degree × sin 60 degree is equal to root 3 by 2

Answers

Answered by subu19

1

√3/2×1/2 + 1/2×√3/2 = (√3/4)×2 = √3/2

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