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Trigonometry Quadrant Functions

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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 = _____________.

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The expert examines trigonometric quadrant functions.

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