$.75x-.25\left(75\right)$
$\frac{12}{2}$
$\frac{\sec^2x-1}{\sec^2x}=\sin x$
$5x^4-3x^4+x^4$
$dx+e^{-3x}dy$
$3x+4y+y-2x+8x$
$\lim_{x\to0}\left(\frac{1}{x+1}\right)$
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