$4x^2-14x+12$

$15:\left(-7+2\right)$

$x^5+x+1x^3+1$

$x=2b^{\frac{1}{2}}\left(\frac{1}{2}-b\right)^{\frac{1}{2}}+\left(\frac{1}{2}b\right)^{\frac{1}{3}};\:a=0;\:b=\frac{1}{4};\:c=\frac{2}{3}$

$5+\left(3+1\right)^2$

$\frac{\sin^4\left(\frac{\pi}{2}\right)}{8}$

$\lim_{x\to1}\left(\frac{\ln\left(x\right)}{2^{\ln\left(x\right)}-x}\right)$