31. Sin 20 degree. Sin 40 degree . Sin 60 degree. Sin 80 degree = 1/16 Prove that.

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Prove that sin square 20 degree + sin square 70 degree minus 10 square 45 degree is equal to zero

Question 1- sin 6 degree * sin 42 degree * sin 66 degree * sin 78 degree = ?

Question 2 - cos 6 degree* cos 42 degree * cos 66 degree * cos 78 degree =?

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