$\left(4y-5d\right)\left(4y+5d\right)$

$\lim_{x,y\to0,0}\frac{x-y}{x+y}$

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

$2.102\cdot294$

$\int\:3.\sqrt[3]{x}-\frac{4}{x^{\frac{3}{2}}}+3x^{-\frac{4}{3}}+2x^{-1}dx$

$6x^4+5x^3-136x^2+5x+300$

$9t^3u^2+3tu-12t^5u^4+6tu^6$