$\cos\left(180+x\right)=-\cos x$
$\frac{125x^3-y^{12}}{5x-y^4}$
$e^{3\left(\frac{2x}{x^2-1}\right)}-2$
$\frac{50}{\left(cos\:87^{\circ}+cos\:84.2^{\circ}\right)}$
$4y+4+2y-5-2x$
$\int9\left(9x+3\right)dx$
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