$\frac{6}{\sec\left(x\right)+1}-\frac{6}{\sec\left(x\right)-1}$
$10+5\cdot2^2$
$16x^2+16xy^2\:+4y^2$
$\sqrt{x+5=2}$
$+500-150-1200-45+75$
$\lim_{x\to0}\left(x^2+x-1\right)$
$\frac{d^2}{dx^2}\left(4x\sin\left(x\right)\right)$
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