Q. 16

Find the ge

Answer :

Given equations is cos 3x + cos x – cox 2x = 0

2 cos2x cos x – cos 2x = 0

cos 2x( 2cos x – 1) = 0

cos 2x= 0 or 2 cos x – 1 = 0

cos 2x= 0 or cos x = 1/2

where n ϵ Z and Z is set of integers

where n Z and z is set of integers

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