The equation $(\operatorname{cosp}-1) x^2+(\cos p) x+\operatorname{sinp}=0$ in the variable $x$, has real roots. Then p can take any value in the interval

The equation $$x^3+x-1=0$$ has

The quadratic equation whose roots are the numbers having arithmetic mean 34 and geometric mean 16 is

The rational form of a number 1.41 is