$\lim_{x\to3}\left(\frac{4^{x-3}-1}{sin\left(\pi x\right)}\right)$

$x^2+y^2=4a^2x$

$\int\frac{\sin\sqrt{x}}{\sqrt{y}}dx$

$-5+\left|7-2\left(1-9\right)-3+12\right|+4$

$3n\cdot3n^3$

$\left(2x^2-7x-15\right)$

$\left(\frac{3}{5}a^{2m}b^6\right)^2+\left(4a^{n-1}\right)^2$