$\frac{x+1}{x+3}+\frac{x+2}{x+4}$
$\int\frac{-x-4}{6x^2+x+2}dx$
$-\sin\left(x\right)=\sqrt{3}\sin\left(x\right)\tan\left(x\right)-2\sin\left(x\right)$
$5<4x+6$
$\:\frac{\:\:\cot\:\left(\:\:x\:\:\:\right)\:\:+\:\tan\:\left(\:\:x\:\:\:\right)\:\:\:\:}{\:\:\sec\:\left(\:\:\:\:x\:\:^{\:2\:\:}\:\:\:\:\:\right)\:\:\:\:}\:\:\:$
$\lim_{x\to-2}\left(\frac{x^3-8}{x^4-16}\right)$
$=\frac{\cos x}{\tan x\cdot\left(1-\sin x\right)}$
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