Cos 30- cos 70=2 sin 50. sin 20.

asked Jan 19, 2021 182k views

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5 votes

L.H.S=2sin(30+70/2).sin(70-30/2)

=2 sin(100/2).sin(40/2)

=2sin50.sin20

Therefore,L.H.S=R.H.S proved

Luca Rossi answered Jan 25, 2021

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