Question 684843
{{{2cos^2(x) - 3sin(x)=0}}}
cos^2 = 1 - sin^2
{{{2(1 - sin^2(x)) - 3sin(x)=0}}}
{{{2sin^2(x) + 3sin(x) - 2 = 0}}}
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sub y for sin(x)
{{{2y^ + 3y - 2 = 0}}}
*[invoke solve_quadratic_equation 2,3,-2]
sin(x) = -2, ignore, no real numbers.
sin(x) = 0.5
x = pi/6 + 2n*pi, n = 0,1,2,3
x = 5pi/6 + 2n*pi, n = 0,1,2,3