+28 1. Determine the angle v between 0 and pi/2 that fulfill cos v= cos(8pi/5). The answer can be written as v= (a(pi))/b in which a/b is an simplified fraction.
2.If tan v= -2/5 which values do sin2v and cos2v have? The answer can be written as sin2v= a/b and cos2v = c/d, in which a/b and c/d are abbreviated fractions.
3. Determine the constants A, B, and C so that the formula (3cos x - sin x)^2 applies for all x. The constants A, B, and C are integers.
