$\left(4x^2+3y-8\right)-\left(7x^2+5x-6\right)$
$k=\:cos10+cos110+cos130$
$2^{18}$
$65m^6n^4-39m^4n^3-13m^2n$
$5\left(2x+1\right)\left(2x-1\right)$
$\frac{\left(2-\sqrt{2}+\sqrt{2}\right)}{2}$
$\frac{1+cos^2x}{sen^2}=2csc^2x-1$
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