$x^2+18x+1=0$
$1-\left(sin\theta\:-cos\theta\:\right)\left(sin\theta\:\:-cos\theta\:\right)$
$f\left(x\right)=\sqrt[4]{\frac{x+3}{x-1}}$
$-4x^2+4x-9$
$1+\sin\left(2a\right)=\left(\sin\left(a\right)+\cos\left(a\right)\right)^2$
$\int_2^4\frac{1}{x-6}dx$
$14a-25a$
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