4315.sagews

set_verbose(-1)
x=var('x')
f=sqrt(cos(x))*cos(300*x)+sqrt(abs(x))-0.7*(4-x*x)^0.2

plot(f,x,(x,-2,2))

$f=\sqrt{\cos(x)}\cos(300x)+\sqrt{\left|x\right|}-0.7(4-x^2)^{0.2}$