$7\cos\left(2x\right)=7\sin\left(x\right)^2+2$
$\lim_{x\to5}\left(\frac{x^2-25}{x^2+6x+5}\right)$
$x^2\:=\:5\:-\:x$
$2x^{-3}\cdot2x$
$\left(a^6\right)^{-2}$
$-x+11=x+1$
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