$\left(3x+2s+3r\right)^2$

$sec^2x+3tan^2x=13$

$\lim_{x\to\frac{\pi}{2}}\left(5sin\left(x\right)\right)^{8tan\left(x\right)}$

$\left(5x^2y\right)\left(-6xy^2\right)$

$+8-3\left(-3+11-7\right)+\left(-18\right)$

$3sin\left(x+45\right)=2$

$\frac{3a^5-11a^3-3a^2+2}{3a^2-2}$