$4m+3m-7m+5m$

$29.8-72.01$

$\left(-x+1\right)+\frac{\left(x+3\right)}{\left(x+1\right)}$

$2x^23x+2.25$

$\sin\left(x\right)=\tan\left(\frac{x}{2}\right)+2\cdot\sin\left(\frac{x}{2}\right)^2\cdot\cot\left(x\right)$

$16y^{2+24y+9}$

$\left(2cosx\right)\left(cosx\right)+\left(senx\right)\left(2senx\right)$