$\log_{10}\left(x\right)=12.15$

$\left(4x^4-18x^2y\right)$

$\left(1-\cos\left(x\right)^2\right)\csc\left(x\right)\sec\left(x\right)$

$\frac{35m^2n}{7m^{-2}n^{-1}}$

$a^4+4a^2-16$

$-\frac{2}{3}_+\frac{1}{6}$

$2\left(x-5\right)^2+\left(x^2-10x-3\right)^2-\left(x^2-10x-2\right)^2$