$3x^5+4x^5$

$9x^2<1$

$cos^2x-\left(\frac{4}{5}\right)^2x$

$\left(12-3\right)-\left\{1-\left(2-6\right)\right\}$

$\frac{\left(1-\tan^2\left(x\right)\right)}{\sec^2\left(x\right)}=1-2\sin^2\left(x\right)$

$\left(\frac{3x^2}{2}-\frac{5y}{3}\right)^2$

$\lim_{x\to0}x\ln\left(\sin\left(5x\right)\right)$