The angle θ is in the second quadrant and cosθ=−441√.
Determine possible coordinates for point P on the terminal arm of θ.
a. (5,−4)
b. (−5,4)
c. (−4,5)
d. (4,−5)
Pre-Calc 12 !!!?
2020-08-05 2:16 am
回答 (3)
2020-08-05 2:45 am
As point P is in the second quadrant, the x-coordinate of point P is negative and the y-coordinate is positive.
Then, option b or c may be the answer.
For options b:
cosθ = -5/√[(-5)² + 4²] = -5/√41
For option c:
cosθ = -4/√[(-5)² + 4²] = -4/√41
The answer is option b or c, depending the given value of cosθ.
(Most probably, the answer is c.)
Then, option b or c may be the answer.
For options b:
cosθ = -5/√[(-5)² + 4²] = -5/√41
For option c:
cosθ = -4/√[(-5)² + 4²] = -4/√41
The answer is option b or c, depending the given value of cosθ.
(Most probably, the answer is c.)
2020-08-05 2:22 am
Please explain this notation --> cosθ = −441√
The range of cosine is -1 to 1, so I can't figure out what you meant.
As for the answers, you can eliminate a and d because they are in the wrong quadrant.
Answer:
It's either b. (−5,4) or c. (−4,5)
The range of cosine is -1 to 1, so I can't figure out what you meant.
As for the answers, you can eliminate a and d because they are in the wrong quadrant.
Answer:
It's either b. (−5,4) or c. (−4,5)
2020-08-05 2:41 am
looking at the ' answers ' I will assume that cos Θ = -4 / √41...which means c) is the answer
收錄日期: 2021-04-24 07:57:13
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