$\tan150=\tan30$
$\frac{1}{25}x^2-\frac{1}{10}xy+\frac{1}{16}y^2$
$\left(x^2+2x-3\right)\cdot\left(x^4+x^2+x^3+x-2\right)+4x-4$
$y\left(x-4\right)=x\left(y-6\right)$
$2ux-uy+5u=2$
$1-\left(7^3\right)$
$\left(ab^3c^2+1\right)^2$
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