$\int\:9xe^{4x}dx$

$\int_{\frac{\pi}{2}}^{\frac{3\pi}{2}}\left(cosx\right)dx$

$3+12\cdot19-10$

$\cos\left(c\right)\tan\left(c\right)=\sin\left(c\right)$

$\lim_{x\to-0.1}\left(1-\cos\left(x\right)\right)$

$49k^2-28kp+4p^2$

$y\ln\left(x\right)\frac{dy}{dx}=\frac{y-1}{x}$