Sin40sin100sin20 = root3/8
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sin 100 / 2 (2 sin 20 sin 40)
sin(180-80) / 2
sin 80 / 2
sin 80 cos 20 / 2 - sin 80 / 4
sin(80+20)+sin(80-20)-sin 40 / 4
sin 100 /4 +sin 60 / 40 - sin 80 / 4
sin (180-80) / 4 + root3/8 - sin 80 / 4
sin 80 / 4 + root 3/8 - sin 80 / 4
root3/8
RHS hence prooved
sin(180-80) / 2
sin 80 / 2
sin 80 cos 20 / 2 - sin 80 / 4
sin(80+20)+sin(80-20)-sin 40 / 4
sin 100 /4 +sin 60 / 40 - sin 80 / 4
sin (180-80) / 4 + root3/8 - sin 80 / 4
sin 80 / 4 + root 3/8 - sin 80 / 4
root3/8
RHS hence prooved
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