Math, asked by chakrabortyklinjali, 1 year ago

Prove that 4 sin23 sin37 sin83 =cos21

Answers

Answered by Anonymous
7
simple yrr so simple ..

4 sin23 sin37 sin83

4sin23 sin37 sin83 = 4 × 1/4 ( sin23× 3)

= sin69 = sin( 90 - 21 ) = cos21 prooved

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