$$\frac{d}{dx}tan\:sin^4t$$

$$\cos^2\left(x\right)+\frac{\tan^2}{1+\sec\left(x\right)}+\sin^2\left(x\right)=\sec\left(x\right)$$

$$4a\:-3c\:+7a+9c$$

$$+4+-1$$

$$\left(z+15\right)\cdot\left(z+7\right)$$

$$\left(-101\right)\left(33\right)$$

$$-2\left(-2x-1\right)$$