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Reductions Involving Aldehydes or Ketones

Cos 20° cos 4...

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Cos 20° cos 40° cos 60° cos 80° =

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cos 20^{0} cos 40^{0} cos 60^{0} cos 80^{0} = \frac{1}{8 a}

a

cos 20^{\circ} \cdot cos 40^{\circ} \cdot cos 60^{\circ} \cdot cos 80^{\circ} = . . . . .

Q. Prove that --
cos20°cos40° cos60° cos80° =1

Q. The value of

cos 20^{o} cos 40^{o} cos 60^{o} cos 80^{o}

cos 20^{o} . cos 40^{o} . cos 60^{o} . cos 80^{o} = \frac{1}{16}

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