Question

sin20sin40sin60sin80=3/16

Answer 1

yeah sure for your help

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Thanks !

Here is your answer which you are searching for

Question :- prove that Sin20sin40sin60sin80 = 3/16

Answer :- $\frac{\sqrt{3}}{2} . \frac{-1}{2}$ ( cos60 - cos20 ) . sin 80)

$\frac{-\sqrt{3}}{4}$ ( cos60 . sin80 - cos20 . sin80 )

$\frac{-\sqrt{3}}{4}$$(\frac{1}{2} .sin 80 - \frac{-1}{2} ( sin100 + sin60 ))$

$\frac{-\sqrt{3}}{4} . \frac{-\sqrt{3}}{4}$

===> $\frac{3}{16}$

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Warm Regards

@Brainlestuser

Answer 2

DEAR STUDENT,

Kindly check the attached papers for a detailed solution along with step by step elaboration to reach our final solution that is our final desired or required answer to this query that is completely proved.

$\boxed{\bf{\underline{L.H.S. = R.H.S.}}}$

Which is the required proof or solution process for this type of query.

Hope this helps you and solves your doubts for applying trigonometric identifies to reach a proper solution or a proof!!!!!