FIND x PLEASE 2cos3x cosx 312sec2x2 2sinx 1 2cosxSolution2 c

FIND x PLEASE

2cos³x =cosx

(3)^1/2sec²x=2

2sinx= 1- 2cosx

2 cos³x=cosx

2cos³x-cos x=0

cos x(2cos²x-1)=0

cos x=0 , 2cos²x-1=0

x=pi/2, 3pi/2, x=+-cos^-1(1/sqrt2) = pi/4, 3pi/4 , 5pi/4 , 7pi/4

FIND x PLEASE 2cos3x =cosx (3)1/2sec2x=2 2sinx= 1- 2cosxSolution2 cos3x=cosx 2cos3x-cos x=0 cos x(2cos2x-1)=0 cos x=0 , 2cos2x-1=0 x=pi/2, 3pi/2, x=+-cos-1(1/sq

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