Help 48,49
48.
arctan (5.67) = 79.99° = 80°
49. I just subbed "x" for "theta"....same difference
sin^2 x 1 - cos^2x (1 + cos x) (1 - cos x)
________ = _________ = _________________ = 1 - cos x
1 + cos x 1 + cos x 1 + cos x