$18x=-216$
$4b^2+28bc+49c^2$
$25c+30c$
$\frac{2cosx-2cos^3x}{sinx}=sin2x$
$2xy\left(y+3x+1\right)$
$\left(6x^3-x\right)\left(10-20x\right)$
$-cos\left(-x\right)+secx=tanxsinx$
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