$3\cos\left(x\right)=0$

$\int\left(7\sin\left(x\right)+\cos\left(x\right)\right)dx$

$\left(a^6+9\right)\left(a^6-9\right)$

$\int\left(\sec^2\left(x\right)-sen\left(x\right)\right)dx$

$\left(x-y\right)\left(x+8y\right)$

$\left(-\frac{1}{2}x^2y\right)\left(-\frac{3}{5}xy^2\right)\left(-\frac{1}{4}x^2y\right)$

$\frac{\tan190^{\circ}\cos350^{\circ}}{\sec260^{\circ}}$