Math, asked by abhinavmohanmaot3ahc, 1 year ago

Solve cos 4x= cos 2x

Answers

Answered by ayu8937

1

Answer:

cos4x-cos2x=0

-2sin [(4x+2x)/2]sin [(4x-2x)/2]=0

-2sin (6x/2)sin(2x/2)=0

-2sin3xsinx=0

sin3xsinx=0/-2

sin3xsinx =0

Either 3x will be 0 or sinx will be 0

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