$\left(-8+3\cdot7\right)-\left(44-\left(-6\right)+5\cdot\left(-9\right)\right)$

$2y-xy=2x$

$\lim_{x\to0}\left(\frac{1-e^{\left(2x+y\right)^2}}{sen^2\left(2x+y\right)}\right)$

$\frac{sin^3\left(x\right)+cos^3\left(x\right)}{sin\left(x\right)+cos\left(x\right)}=1$

$y\left(x\right)=3\cdot y\left(\frac{x}{2}\right)$

$e^{0.25}$

$\left(1+\cot^2\left(x\right)\right)\tan\left(x\right)=\csc\left(x\right)\sec\left(x\right)$