$-3mn-m-n+4mn-2m+5n-m-2n-mn$
$\frac{\left(1+2sinxcosx\right)}{sinx+cosx}=sinx+cosx$
$3\left(5x\:-\:4y\right)\:$
$\frac{\cos\left(x\right)\left(1+\sin\left(x\right)\right)}{\sin\left(x\right)}$
$\sin\left(4x\right)-sin\left(2x\right)=sin\left(x\right)$
$85\cdot\left(-100\right)$
$\sqrt{x^3}+2$
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