Answer:
cos θ = 13/18 ≈ 0.72
sin θ = √155/324 ≈ 0.69
Step-by-step explanation:
unit circle: radius = 1
terminal point: (13/18,y), θ in first quadrant, sinθ and cosθ are all positive
cos θ = (13/18)/1 = 13/18 ≈ 0.72
sin θ = y/1 = y = √1-cos²θ = √1 - (13/18)² = √155/324 ≈ 0.69
