$9 x = 108$

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

$\lim_{x\to\infty}\left(\frac{43x^3}{e^x}\right)$

$\frac{-2+\sqrt{2^2-4\left(-2\right)\left(12\right)}}{2\left(-2\right)}$

$9sen^2a-12sena=1$

$\left(a+b\right)^3\cdot b\:-\left(a\cdot b\right)^2b-\left(a\cdot b\right)^2b^3+ab^4$

$\left(15x-3m-5b\right)\left(8x-6m-8b\right)$