Evaluate −4x−y+4 when x=−14 and y=3. the value of the expression is ?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Abcd is reflected across the x- axis, then rotated 90 clockwise about the orgin, and finally reflected across the line y= x to form a’ b’ c’ .

What is the surface area of the sphere?