pj8184423
pj8184423
28-12-2020
Mathematics
contestada
cos 30- cos 70=2 sin 50. sin 20.
Respuesta :
prashant12345
prashant12345
28-12-2020
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
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