$\cos\left(-20\right)\cos\left(-50\right)-\sin\left(-20\right)\sin\left(-50\right)$
$\frac{d}{dx}x\ln\left(x\right)-x+c$
$\:2a\:+\:3a\:$
$2k^44k$
$\frac{2}{2^{-2}}$
$tan\left(x\right)cos\left(x\right)cot^2\left(x\right)$
$\frac{1}{\sec^2a\cdot\left(1-\sin^2a\right)}$
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