$\frac{3}{\left(1+2x\right)^2}$
$\lim_{x\to\frac{\pi}{2}}\left(\left(\pi-2x\right)secx\right)$
$\frac{d^2}{dx^2}\:\ln\left(sin\:\left(x\right)\right)$
$\left(-3g^6n^2\right)\left(-4g^2n\right)$
$17x-71=9x-47$
$\:-33cosx\:-\:56sinx$
$9^2.\:9^1$
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