1. If cos θ = 4/5 and θ is in quadrant IV, find the values of the trigonometric functions of θ.
2. Suppose θ is in the interval (90º, 180º). Find the sign of each function value.
(a) cos θ/2
(b) cot(θ - 180º)
2. Use the reciprocal, quotient, and Pythagorean identities to give three expressions that complete the following statement:
cot θ = _____________.
The expert examines trigonometric quadrant functions.