$\frac{1}{1+\cos^2\left(x\right)}=\frac{\sin^2\left(x\right)}{1+\cos^4\left(x\right)}$
$\int5\left(2x+3\right)^4dx$
$12\:+\:10\:\cdot\:-1\:\cdot\:3$
$3a^2-a-10$
$\frac{x}{x+2}<4$
$2\left(6+7x\right)-3\left(8x-1\right)$
$\ln\left(\sqrt{\frac{x^2+x-6}{x^2-4}}\right)$
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