$a3-43$

$x^4+2x^2-3x\cdot x^3-2x^2+5$

$\int\frac{1}{\left(49-x^2\right)^{\frac{1}{2}}}dx$

$\frac{dy}{dx}=3\left(y-4\right)\:y\left(0\right)=12$

$-\frac{2m^2n^6}{2mn^4}$

$\frac{\left(8sin\left(x\right)+9tan\left(x\right)\right)}{tan\left(x\right)}$

$\left(x-4\right)^2=7$