value of sin 20 into sin 40 into sin 60 into sin 80 is
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sin 20.sin 40.sin 60.sin 80
sin20. sin 40. sin60. sin80
=> sin60[sin20.sin40.sin80]
=>√3/2[sin20.sin(60-20).sin(60+20)]
=>√3/2[sin 3(20)/4]
=>√3/2[sin 60/4]
=>√3/2[√3/2*4]
=>√3/2*√3/8
=3/16
sin20. sin 40. sin60. sin80
=> sin60[sin20.sin40.sin80]
=>√3/2[sin20.sin(60-20).sin(60+20)]
=>√3/2[sin 3(20)/4]
=>√3/2[sin 60/4]
=>√3/2[√3/2*4]
=>√3/2*√3/8
=3/16
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