# Let us determine the value/value of for which 2 cos2 θ – 3 cos θ + 1 = 0 will be true.

Given, 2cos2θ -3cosθ + 1

Need to check the equation is true for different values of theta

let θ = 0°

2cos20° -3cos0° + 1

cos0° = 1

2(1)2 – 3(1) + 1

= 2-3 + 1

= -1 + 1

= 0

Hence, if θ is 0 the given equation will be true

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