$28a^3b+35ab^3$
$\frac{x^2+6x+8\:}{x^2+5x+4}$
$\:\:20\:+\:15\:+\:40\:+\:\left(-12\right)\:+\:60\:+\:\left(-30\right)$
$\lim_{x\to3}\left(\sqrt{7x+9}\right)$
$sin\left(\frac{\pi}{2}-x\right)\sec\left(x\right)=1$
$3+\frac{2}{x}$
$\frac{d^2y}{dx^2}=\sin\left(3x+\frac{\pi}{2}\right)$
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