$\frac{25}{9}x^2-\frac{11}{3}xy^2+\frac{121}{100}y^4$

$\int_1^2\left(-\frac{4x}{y}\right)dx$

$12x^2-36x+27$

$\frac{\tan\left(x\right)-1}{\sec\left(x\right)+\csc\left(x\right)}$

$\lim_{x\to\frac{a}{2}}\left(\frac{1-senx}{1+cos2x}\right)$

$\lim_{x,y\to0,0}\left(\frac{\left(e^x-1\right)\left(e^{2y}-1\right)}{xy}\right)$

$\left(8x^2+2y\right)^2$