PLS ANSWER OMG ITS DUE RN U DONT HAVE TO EXPLAIN BUT IF U DO I WILL GIVE U BRAINLIEST
LOTS OF POINTS CUZ ITS A LOT OF WORK
PLS ANSWER

Find the value of the cosine for angle a

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).

For each proportion find the unknown number x 1/5/8=×/15