$\left(+96\right)\:x\:\left(-54\right)$

$x-2>5$

$\left(-20\right):\left(+4\right).\left(-2\right)$

$3xy^221xy^3and15xy^2$

$sin\left(x\right)cos^2\left(y\right)dx-cos\left(x\right)sin\left(y\right)dy=0$

$\left(\frac{3}{5}x^4y^2-8y\right)\left(\frac{3}{5}x^4y^2+8y\right)$

$\cos\left(7x\right)\sin\left(9x\right)$