P is a point
inside
square
ABCD
, show that [APB]+[DPC] =[APD] + [BPC]

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).

Evaluate cos2θ for cosθ = square root of 3/2

Standard deviation of 19,29,21,22,23