Answer:
The answer to your question is:
a) sin (-210) = 1/2
b) cos (-210) = - √3 / 2
c) tan (-210) = - √3 / 3
Step-by-step explanation:
a) sin Ф = - 210°
sin (-α) = -sin(α)
In the third quadrant 210° - 180° = 30°
sin (-210) = - 1/2 In the third quadrant sin is negative, then sin will be positive.
sin (-210) = 1/2
b) cos (-210) = cos (210)
In the third quadrant cosine is negative, so cosine will be negative
cos (-210) = cos (210)
= - √3 / 2
c) tan (-210) = - tan(210)
In the third quadrant tan is positive, then tan will be negative
tan (-210) = - √3 / 3
