$\left(n+3\right)+\left(n+5\right)$
$\cos^2\left(t\right)=1-\sin^2\left(t\right)$
$-\left(-3\right)+\sqrt{\left(-1\right)^2-4\left(2\right)\left(-3\right)}$
$x^2-y^2-1=0$
$\frac{x^2+1}{3-x}$
$\cos\left(\arccot\left(1\right)+\arccos\left(\frac{1}{2}\right)\right)$
$\:\:\:\:\:-45x\:-9$
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