If 2 cos^2 + 3 cos = 2 then find cos
kunal0912:
1/2
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Let cos theta = x
so, 2x^2 + 3x - 2 =0
so, 2x^2 + 4x - x -2 = 0
2x(x+2) -1(x+2) = 0
Hence, x = 1/2 or x = -2
but value of cos theta cannot be -2
Hence cos theta = 1/2
Hence, theta = 60°
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