Prove that sin20°. sin40°. sin60°. sin80° = 3/16
Prove that sin20°. sin40°. sin60°. sin80° = 3/16
Shalini Rai , 13 Years ago
Grade 12
Trigonometry> Trigonometric Ratios and Identities...
1 Answersmd salik
=sin20 sin40 sin80 sin60
=1/4 sin60 sin 60 {sinx sin(60-x) sin(60+x)=1/4 sin 3x}
=1/4 *(sin 60)2
=1/4 *3/4
=3/16
proved
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