1.4 - Trigonometric Functions of Any Angle. Objectives. Evaluate trigonometric functions of any angle. Use reference angles to evaluate trig functions. Use trig identities to evaluate trig functions Use trig models to solve real world problems. Definitions of trigonometric functions.
Syr Cxr Tyx
All 6 trig functions are positive in quadrant 1
Let θ be an angle in standard position. Its reference angle is the acute angle θ‘ formed by the terminal side of θ and the horizontal axis.
Find the reference angle θ', and sketch θ and θ' in standard position.
1) θ = -145°
horizontal distance traveled by a golf ball hit at an angle of 40˚ with an initial speed of 125 feet per second.