Math, asked by hibafathimathul42, 2 months ago

sin x + sin 3 x/ cos x + cos 3 x = tan 2x

Answers

Answered by pratibhaahirwar25

0

Answer:

tan2x

=R.H.S

Step-by-step explanation:

LHS=sinx+sin3x/cosx+cos3x

=2sin[x+3x/2]cos[x-3x/2] / 2cos[x+3x/2]cos[x-3x/2]

=sin2x/cos2x

=tan2x

=RHS

hence proved

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