$10^2-9^2$

$\int\frac{\left(8x+4\right)}{\sqrt{1-4x^2}}dx$

$\frac{\left(-2\cdot4^2-4\right)}{\left(4^2-3\cdot4+2\right)}$

$\left(5+x\right)\left(3-x\right)$

$y^2\:-\:121\:$

$x-26<14$

$\sin\left(\frac{13\pi}{15}\right)cos\left(-\frac{\pi}{5}\right)+cos\left(\frac{13\pi}{15}\right)sin\left(-\frac{\pi}{5}\right)$