$49k^2-28kp+4p^2$
$\lim_{x\to\infty}\left(x^2-\ln\left(x\right)\right)$
$7x-3y+7y-5x-8x$
$\left(a^m\right)^n$
$-6t^2w+12tw^2-3t^2w+6tw$
$a-b-a+b$
$\frac{cos\:x+sin\:x}{cos\:x-sin\:x}=\frac{1+sin\:2x}{cos\:2x}$
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