Select all true statements . (remember the reference angle is the perspective from which the question or you are looking)

A. In a right triangle any angle can be used as the reference angle for sin/cos/tan

B. In a right triangle only the two acute angles can be used as the reference angle for sin/c cos/tan

C. In a right triangle the right angle can be used as the reference angle for sin/cos/tan

D. in any triangle any angle can be used as the reference angle for sin/cos/tan