$1+\cos10y=2\cos^{2}5y$
$\:tanx\:-\:secx.cscx$
$g\left(x\right)=\frac{x-9}{x}$
$4t^2+12t+9$
$3\left(8-5\right)+5\left(-6-4\right)-\left(7-6\right)$
$\frac{\left(2^n\right)x^n}{\sqrt{\left(4n+1\right)\cdot\:5^n}}$
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