Prove that sin 20*sin40+sin60*sin80=3/16 how does it comes
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Answer:
Correct your Question first .
it will be sin20*sin40*sin60*sin80
Now see solution : -
Step-by-step explanation:
sin20*sin40*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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