I need to find the slope! can u help me?

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

Find the zeros of each function. f(x) = x^2 + 5x - 6