$\lim_{x\to infinity}\frac{cos\left(x\right)-1+\frac{1}{2}x^2}{x^4}$
$19=3y+4$
$60k^5m^4+75k^3m^7-45k^2m^9$
$9a^2b^2c^2-9a^2b^2$
$12x^2-15$
$\left(x+9\right)\left(x-7\right)$
$\cos\left(x+30\right)=-\sin\left(x-60\right)$
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