$\sec\left(x\right)^2+\csc\left(x\right)^2=\frac{1}{\sin\left(-0.8\right)^2\cdot\cos\left(x\right)^2}$
$5k+9k$
$4a^2-10a-25$
$\int\left(\frac{1}{\left(4-x\right)}\right)dx$
$x^2+x-x^2+2x-1$
$-\frac{14}{x+4}\:=\:-\frac{6}{x}$
$x^2+3x+154$
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