1+ cos(12x) = a. 2sin^2(6x) b. 2sin^2(12x) c. 2cos^2(12x) d. 2cos^2(6x)

Kilgore trout creates a new scale to diagnose depression. however, his scale only assesses one symptom of depression while ignoring others. which of the following is his new scale most likely lacking? a) test-retest reliability b) discriminant validity c) criterion validity d) alternate-forms reliability e) content validity f) none of the above