Verify that: cos(x+y)cos(x-y)=cos^2x-sin^2y

using trig idenities, i can get to: cos^2xcos^2y-sin^2xsin^2y but i can't figure out how to get rid of sin^2x and cos^2y. anybody?

Which statement best describes the relation between correlation and causation? a. correlation results in causation. b. correlation does nog imply causation. c. correlation and causation are unrelated. d. correlation and causation are the same thing.

Find the volume of the solid generated when the region bounded by y= x and y= 4√x is revolved about the x-axis the volume of the solid is: (type an exact answer cubic units)

Which of the following three dimensional figures has a circle as it’s base