$x^2-8x+3=11$
$x-3=3$
$m^2\left(-1+m\right)-2$
$3^3x\:3^5:\:3^2$
$sin2x=0.3$
$\frac{5x^4-3x^3+6x^2-6}{x+2}$
$\frac{1-tan^2x}{cos^2x-sin^2x}$
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