Prove that 4 sin23 sin37 sin83 =cos21
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simple yrr so simple ..
4 sin23 sin37 sin83
4sin23 sin37 sin83 = 4 × 1/4 ( sin23× 3)
= sin69 = sin( 90 - 21 ) = cos21 prooved
4 sin23 sin37 sin83
4sin23 sin37 sin83 = 4 × 1/4 ( sin23× 3)
= sin69 = sin( 90 - 21 ) = cos21 prooved
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