$0,5x^2-3x-1\cdot0,4x^4-2x^2-7$

$64d^2\:-\:16d\:$

$\cos\left(0.45\right)^2+\sin\left(x\right)^2=1$

$4w^6x^2-24w^3xyz+36y^2z^2$

$\frac{\sin\:\left(x+h\right)-\sin\:\left(x\right)}{h}=\frac{\sin\left(\frac{h}{2}\right)}{\frac{h}{2}}\cdot\cos\left(x+\frac{h}{2}\right)$

$4x^2-6x=0$

$\frac{x^2+2x}{3x^2-18x+24}\cdot\frac{x^2-4x+4}{x^2-x-6}$