$$-15.450\:+-16.890\:$$

$$-40cd+16c^2+25d^2$$

$$\int_{-1}^1\frac{3arccos\frac{x}{2}}{5}dx$$

$$\int tan^5\theta sec^3\theta\:\:d\theta\:\:$$

$$n^2+3n-54$$

$$3x\:+\:1\:;\:x=3$$

$$\frac{\left(x-2\right)^n}{\left(2^n\left(n+1\right)\right)}$$