0 degree lessthanorequalto K lessthanorequalto d 360 degree

0 degree lessthanorequalto K lessthanorequalto d 360 degree rightarrow 28 ln 2x + cos x = 0 Which is not a solution? 14.5 degree 90 degree 194.5 degree 270 degree

Solution

2sin2x+cosx=0

4sinx cos x+cos x=0

cosx(4sin x+1)=0

Cos x =0 , sin x=-1/4

x=90,270,194.5

Correct option is 1