$x^{3}+4=2y^{2}+2x^{2}$
$\left(-7\:a^2c^2\right)\left(2\:a^4bc^6\right)$
$9=15-2x$
$\lim_{x\to0}\left(6x+cosx\right)^{\frac{1}{x}}$
$\left(x^5+3x^4-7x^3+2x^2+8x-1\right)-\left(x+1\right)$
$4-100a^4$
$\cos\left(x-\pi\right)=\cos\left(x\right)$
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