$\left(7y^4+1\right)\left(7y^4-1\right)$

$\frac{-8x^5y^2+2x^4y^3}{4x^2y^2}$

$\int\left(7x+7\right)^{2.7}dx$

$\frac{2}{\text{sena}}=\frac{\text{tana}}{1+\text{seca}}-\frac{\text{tana}}{1-\text{seca}}$

$\int_0^t\left(t^2e^{-4t}\right)dt$

$\frac{\frac{\left(q+1\right)}{\left(q+3\right)}}{\frac{1}{q^7}}$

$2x-2=\left(x+7\right)$