$\cos\left(1+\tan^2x\right)=\sec\left(x\right)$
$\frac{\left(cos\left(x\right)-sec\left(x\right)\right)}{sin\left(x\right)}$
$-x^2-5x+7=0$
$-5sin^2\left(x\right)-4cos\left(x\right)=-4$
$-3x^{-1}$
$a\left(x+l\right)+b\left(x+l\right)$
$\int\left(\sqrt{x^2+11}\right)dx$
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