$\left(e^x\sin\left(y\right)+e^y\sin\left(z\right)+e^z\sin\left(x\right)\right)\left(e^x\sin\left(y\right)+e^z\cos\left(x\right)\right)$

$\sin xdy+\cos\left(y\right)dx=0$

$\:2,5a-0,4a-3,6a+4a$

$\frac{27x^2y^{-3}}{8x^{-4}y^3}$

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

$x^2-y^2=9$

$2x-y+4x-3y+2y+4x+2y$