What is tan f?
a. 8/15
b. 8/17
c. 15/8
d. 15/17

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).

Is it true or false i’m trying to pass this test so i can leave school

Need asap. solve for the following inequality