$c+2=7$
$\frac{d}{dx}30x^2$
$121+88x+9x$
$\cos a\left(1+2\cos a\right)-\cos3a-\cos a=\cos^2a-\sin^2$
$5x+2\left(x+1\right)\ge23$
$5x-14>3x-4$
$\left(x^g\right)^2$
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