$144-36x^2y^2$

$\log\left(x-8\right)+\log\left(5\right)=\log\left(x\right)$

$-\frac{8}{5}-1.5$

$\int\left(x^4-2x^2+3\right)e^{5x}dx$

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

$x^2\ln\left(x\right)-49\ln\left(x\right)=0$

$\text{sen}^2a+3=4-\cos^2a$