$3\sin^2x-\sin x-4$

$\int_1^2\left(sin\left(3\cdot\pi\cdot x\right)\cdot\left(-sin\left(3\cdot\pi\cdot x\right)\cdot\left(9\cdot\left(\pi\right)^2\:+1\right)\right)\right)dx$

$\int_{-3}^5\left(\sqrt{5+4x-x^2}+3\right)dx$

$3x-5x^2-1$

$-5.8k\:-\:2\:+\:0.5k$

$5^4.5^{-6}$

$\frac{\left(18x^2-13x-5\right)}{x^2-1}$