$\tan\left(2a\right)-2\tan\left(2a\right)\sin\left(a\right)^2$
$2x^4y^2\left(x^4y^4-2xy\right)$
$3+2x<6x-1$
$\left(-9b^2+6b\right)^3$
$-7mn^2.-5m.17mn^2.-4n$
$\frac{96}{16}$
$3y^4-2x^3y+4x^3-5y^4x+3;\:x=-2;y=3$
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