ASAP PLEASE HELP I WILL GIVE BRIANLEST

Select all true statements .

A. Trig functions will never be alone and will always has an angle measure associated with it .
B. Trig functions can be written alone as long as there a ratio of two sides associated with it.
C. The only proper way to write (trig function ) equal to the ratio of two sides)
D. The only proper way to write ( function) of an ( angle) is equal to the (of two sides) E. correctly written cos x = 3/4
F. correctly written: sin=3/4