Help #48,49
48.....We can use the tangent inverse to find this
atan (5.67) = 79.997° ≈ 80°
49.
sin^2 θ 1 - cos^2 θ ( 1 - cos θ) ( 1 + cos θ) 1 + cos θ
_________ = __________ = ____________________ =
1 - cos θ 1 - cos θ (1 - cos θ)