Simplifying
$\lim_{x\to\infty}\sqrt{49x^4+3x^2}-7x^2$
$x^2-8x+25$
$x-5=13$
$csc\theta\:+sin\theta\:=\frac{2-cos^2\theta\:}{sin\theta\:}$
$\left(5b^{2}+7a^{2}\right)\left(-5b^{2}+7a^{2}\right)$
$\frac{\left(x^3-2x^2-4x-8\right)}{x-2}$
$21x-\left(3x+9\right)$
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