Question

question no 15 plz answer​

Answer 1

Answer: x=60°

Step-by-step explanation:

cos x +cos 3x = 3- cos 2x

cos 4x + cos 2x=3

cos 6x=3

cos x = 1/2

x= 60° (∵cos 60°=1/2)

Hope it helped :) please mark as brainliest

Answer 2

cosx+cos3x=3-cos2x

cosx+cos3x+cos2x=3

cosx(1+3+2)=3

cosx(6)=3

cosx=3/6

cosx=1/2

∴    x=60°

hope it helps

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