Math, asked by shivannasowmya64, 5 months ago

Prove that sin18°cos72° + cos18°sin72°= 1

Answers

Answered by amzoxx

2

sin(90-72)×cos72+ cos(90-72) ×sin72

cos72 ×cos72 +sin72 × sin72

cos^2 72 + sin^2 72

1

proved.....

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