$\int\left(7\sin\left(3x\right)\cos^5\left(3x\right)\right)dx$

$\frac{dy}{dx}+y\:tan\:x\:=\:sen\:x^2$

$2sin\left(x\right)+2sin\left(x\right)$

$k\left(2-t\right)+2k^2\left(2-t\right)$

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

$\lim_{x\to0}\left(1-sin\left(3x\right)\right)^{\left(\frac{2}{x}\right)}$

$3y\:+4+4y+3+5y+8$