$c^2y+4cy$
$3a-2a+9a$
$\cos^2\left(a\right)-3\sin^2=0$
$\frac{x}{18}=\frac{1}{3}$
$9-25p^{2}$
$4x+3y=7$
$4ab.2a^2-6ab^2$
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