The angle θ(1) is located in quadrant I, and sin(θ1)= 17/20. what is the value of cos(θ1)

Abcd is a parallelogram find the valuse of x

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).

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}