$\frac{\left(\frac{1}{2}x\right)}{\frac{1}{2}}+\frac{\left(\frac{1}{4}\right)}{\frac{1}{2}}\:sen\:2x$

$9n^{2}+30nd+25d^{2}$

$y=\left(1+\frac{1}{x}\right)^x$

$5\cdot4\cdot4$

$75x^2+35x-10=0$

$-4+8\left(27-35\right)-60$

$\frac{3x+1}{5}-\frac{1}{3}\le\frac{2}{15}\cdot\left(3x+2\right)+\frac{4\cdot\left(1-x\right)}{3}$