Which equation is a related equation
1 answer:
You might be interested in
Answer:
1 - cosΘ
Step-by-step explanation:
using the identity
sin²x + cos²x = 1 , then
sin²x = 1 - cos²x
= ← factor 1 - cos²Θ as a difference of squares
= ← cancel 1 + cosΘ on numerator/ denominator
= 1 - cosΘ
ANSWER
EXPLANATION
The given angle is 870°.
870°-360°-360°=150°
This means that:
870° is coterminal with 150°, hence its terminal side is in the second quadrant.
It makes an acute angle of 30° with the x-axis.
Note that cotangent is negative in the second quadrant,
Hence,
The first option is correct.