20sveairving1 20sveairving1

17-04-2019
Mathematics

contestada

Evaluate csc330°.
A: -2sqrt3/3
B: -2
C: 2
D: 2sqrt3/3

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sqdancefan sqdancefan

17-04-2019

Answer:

B: -2

Step-by-step explanation:

The reference angle for 4th-quadrant angle 330° is 30°. The sine is negative in the 4th quadrant, so ...

csc(330°) = 1/sin(-30°) = -1/sin(30°) = -1/(1/2) = -2

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