$100n^2-49m^2x^2$
$\cos\left(x\right)=\left(-\frac{3}{5}\right)$
$\lim_{x\to0}\left(\frac{\sin\left(3x\right)^2}{x^2cosx}\right)$
$-11w^2-1^2$
$x^4-3x^3+4x^2-3x^3+9x^2-12x+4x^2-12x+16$
$x^4+18x^2+121$
$\left(2x^2y^2-8y\right)\left(2x^2y^2-87\right)$
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