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College Algebra & Trigonometry, 2018a

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9.1. TRIGONOMETRIC FUNCTIONS OF NON-ACUTE ANGLES 393<br />

In the problems in this section, the reciprocal functions secant, cosecant and<br />

cotangent are used. Remember that:<br />

sec θ = 1<br />

cos θ = hyp<br />

adj<br />

csc θ = 1<br />

sin θ = hyp<br />

opp<br />

cot θ = 1<br />

tan θ = adj<br />

opp<br />

Exercises 9.1<br />

Determine the quadrant in which the angle θ lies.<br />

1. cos θ>0, tan θ>0 2. sin θ0<br />

3. sec θ>0, tan θ0, cos θ0, cos θ0, cot θ>0<br />

7. sin θ

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