$\lim_{x\to+00}\:\left(e^{\left(\frac{\left(x+3\right)}{\left(x-1\right)}\right)}-e\right)x$

$2x+6x+14x$

$\frac{\left(\sin\left(x\right)+\cos\left(x\right)\right)^2}{\sin^2\left(x\right)-\cos^2\left(x\right)}$

$\int-\frac{7}{4t\sqrt{16t^2-36}}dt$

$a^4a^2b^4+\frac{1}{4}b^4$

$\left(5x+10\right)\left(5x-10y\right)$

$6d-5d$