$-3-\frac{2\left(1-i\right)^7}{\left(1+i\right)^7}$

$\lim_{x\to0}\left(\frac{x}{cos\left(4x\right)-1}\right)$

$\int2e^{2t+6}dt$

$\lim_{x\to\infty}\left(e+x^x\right)^{\frac{1}{x}}$

$\sqrt{\left(-asenteta\right)^2+\left(-a\right)^2+\left(-acosteta\right)^2}$

$\lim_{x\to\infty}\left(\frac{1}{x^5\cdot\:\left(e^{\frac{1}{x}}-1\right)}\right)$

$x^2-34x+64$