Which of the following values is not changed by moving the center of an ellipse? A or b. B. C. A, b, or c

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4

Simplify using positive exponents only.

Will give a: 122 b: 90 c: 48 d: 180