$2x^2-6y^2+14=0$
$8xy-3x-3yx+2y$
$-4y^2+4$
$135x-8x$
$5+2\cos\left(x\right)=4+\cos\left(x\right)$
$2\left(2x+y\right)^2$
$\lim_{x\to0}\left(sec\:\left(x\right)\right)^{\frac{1}{x}}$
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