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zaqwsx

  • 3 years ago

prove that sin20 sin40 sin60 sin80=3/16

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  1. shubhamsrg
    • 3 years ago
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    What is your attempt so far?

  2. TO!RAW!FOR!LIFE
    • 3 years ago
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    calculator.lol dats all you need

  3. Yahoo!
    • 3 years ago
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    Hint: \[sinx.\sin(60-x).(\sin60+x) = \frac{ \sin 3x }{ 4 }\]

  4. sriramkumar
    • 3 years ago
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    sin60 is \[\sqrt{3}/2\] right? put it there in that, and then apply the above formula you'll get it... \[\sqrt{3}/2\] * sin60/4 = 3/2*4*2 = 3/16

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