$n^2+6n+4$

$\left(13+2x\right)\left(2y-13\right)$

$-\left(-17\right)-\left(-5\right)\cdot\left(+8\right)-\left(-9\right)$

$cos\left(x-y\right)sinx-sin\left(x-y\right)cosx-siny$

$\int_0^{\frac{\pi}{2}}x^{2n+1}dx$

$3\left(5x-1\right)=6\left(2x+3\right)-21$

$\int\left(3-4w\right)\left(4w^2-6w+7\right)^3dx$