Can plants the seed of one and a half inch below the ground

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

Why does the shape of the distribution of the weights of russet potatoes tend to be symmetrical?

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