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There is no equation - only an expression. So there are no solutions (or solution intervals).
4
One solution. (cos x)2 - 2cos x = 3 Factor: (cos x - 3)(cos x + 1)= 0 cos x = {-1, 3} Solve: For cos x = -1, x = 180 deg No solution for cos x = 3
how do you find the solution to x<3
2x2+5x-3 = 0 (2x-1)(x+3) = 0 x = 1/2 or x -3