1 Radians to Quadrants = 70 Radians to Quadrants = 2 Radians to Quadrants = 80 Radians to Quadrants = 3 Radians to Quadrants = 90 Radians to Quadrants = 4 Radians to Quadrants = 100 Radians to Quadrants = 5 Radians to Quadrants = 311 0 Radians to Quadrants =Solution The angle 5ˇ 4 will fall in quadrant 2 with a reference angle of r = ˇ 4 Using either a special right triangle or the unit circle, we nd that csc 5ˇ 4 = csc ˇ 4 = 1 sin ˇ 4 = 1 p1 2 = p 2 (e) sec 48ˇ 3 Solution The angle 48ˇ 3 = 16ˇis a quadrantal angle that is coterminal to 2ˇ Thus, sec 48ˇ 3 = sec(16ˇ) = 1 cos16ˇ = 1 cos2ˇ = 1 1 = 1 (f) cos 11ˇ 3 Solution TheIf the terminal arm of an angle falls in quadrants 2, 3 or 4, we use a reference angle of 6;
Section 4 3 Precalculus Final
