Asked by Don Morris

Find all the angles between 0° and360° which satisfy: 2sin^2 y - 3cos y = 0?
Answered by R_scott
substituting ... 2[1 - cos^2(y)] - 3 cos(y) = 0 ... -2 cos^2(y) - 3 cos(y) + 2 = 0

solve the quadratic for cos(y) and fill in the angles
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