$\lim_{x\to0}\left(2-\ln\left(x\right)\right)^{x\:\sin\left(x\right)}$
$\left(\cos\left(x\right)\right)+1=\left(-\cos\left(x\right)\right)$
$-1\:+\:72\:+\:14\:+\:-7\:+\:6$
$-5\left(x-10\right)^2$
$\frac{1}{\sec}=\sin^{2}\cdot\cos^{2}+\cos^{4}$
$78^4$
$7.a+2.a$
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