$2x\left(4x-5\right)=3$

$98.765+146.38+2.675+36.4186+2.3+158-.16$

$\frac{4x^3y^2}{2x^3y}$

$\left(2+3\:.\left(-4\right)\right).\:2+18:\left(2-4.\:2\right)$

$\frac{d}{dx}x^3e^{4y}+6x^2+9y^2=9x+6cos\left(y\right)+6sen\left(x\right)$

$\sqrt{-45}$

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