$4.\left(13.8\right)+3\cdot\left(9\cdot15\right)$
$\lim_{x\to11}\left(\frac{8x}{\sqrt{x+5}}\right)$
$\log\left(2x-8\right)=\log\left(4x+7\right)$
$\frac{2\cos\left(a\right)}{\cos\left(2a\right)\sin\left(a\right)}=\csc^2\left(a\right)\tan\left(2a\right)$
$5<9-15<27$
$\frac{d}{dx}\left(y=x^2\left(x-1\right)\left(x+3\right)\left(x+2\right)\right)$
$\int\frac{x}{\left(4-x\right)^3}dx$
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