$\int wx^{az+b}dz$

$\lim_{x\to0}\left(\frac{a\sin\left(\frac{\pi x}{r}\right)}{x}\right)$

$\lim_{x\to0}\left(\frac{cos6x\left(tan6x\right)}{x}\right)$

$\int49tan^5xsec^4x\:dx$

$\left(64x^4-25y^2\right)$

$\lim_{x\to4}\left(\frac{x-4}{2x^2+8x}\right)$

$\int\frac{x^2+2}{x^2\left(x^2+4\right)}dx$