Question 930586
3sinx-3cosx=1
sin - cos = 1/3
sin - sqrt(1 - sin^2) = 1/3
- sqrt(1 - sin^2) = 1/3 - sin
1 - sin^2 = 1/9 - 2sin/3 + sin^2
2sin^2 - 2sin/3 - 8/9 = 0
*[invoke solve_quadratic_equation 2,-2/3,-8/9]
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sin(x) =~ 0.853851
x = 1.02334 radians (the principal value)
sin(x) =~ -0.52052
x = 5.7357 radians