$14a^2b+10a^2b$
$k^2+11k^2+30$
$9x^3y^2+45x^2y^6-120x^5y^3-30x^9y^4$
$\cos\left(2x\right)=\frac{\sin\left(2x\right)-\tan\left(x\right)}{\tan\left(x\right)}$
$2\cdot19-8\cdot\left(-24\right)$
$\frac{4^{-3}}{4^{-7}}$
$7a^2b^2\left(b-4a\right)$
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