$\sqrt{25}.\sqrt{36}$

$30^2-15^2+c$

$\frac{\sec\left(x\right)^2\csc\left(x\right)}{\sin\left(x\right)}$

$\left(2x^2+3x+8\right)\left(3x^2+5x+4\right)$

$\left(x-y\right)\left(x+2y\right)$

$\left(5\cos^{2}x\right)\left(1-\csc^{2}x\right)=-\cos^{2}x$

$\left(2x^2+5x-3\right)\left(-3x^2\right)$