Math, asked by ishaanmaharjan, 8 months ago

Express each of the following as sum or difference form. 2sinA.sinB

Answers

Answered by Anonymous
0

NANBA..

L.H.S=cosx+cos(120-x) +(120+x)

=cosx+2cos120.cos5x {चुकि =cos(A+B)=cos(A-B) =-2sinA.sinB}

=cosx+(-2cos(180-60)cosx

=cos-2.1/2.cosx

=cosx-cosx

=0 R.H.S proved

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