Asked by Danny
1. Use half-angle identity to find the exact value of cos165.
MY ANSWER: (-1/2)sqrt(2+sqrt(3))
2. Solve 2 sin x + sqrt(3) < 0 for 0<= x<2pi.
MY ANSWER: (4pi/3)< x < (5pi/3)
3.Write the equation 2x+ 3y-5=0 in normal form?
(-2sqrt(13)/13)x - (3sqrt(13)/13)y + 5sqrt(13)/13) = 0
MY ANSWER: (-1/2)sqrt(2+sqrt(3))
2. Solve 2 sin x + sqrt(3) < 0 for 0<= x<2pi.
MY ANSWER: (4pi/3)< x < (5pi/3)
3.Write the equation 2x+ 3y-5=0 in normal form?
(-2sqrt(13)/13)x - (3sqrt(13)/13)y + 5sqrt(13)/13) = 0
Answers
Answered by
Reiny
your first one cannot be right since your result < - 1,
and the cosine and sine of any angle cannot be greater than 1 or less than -1.
there are several ways to split up 165
1. 165 = 180 - 15
2. 165 = 90 + 75, but 75 = 45 + 30
unless I misses an obvious combination, it looks like you have do this in 2 steps
third question is correct, if you follow the formula
(don't know why anybody would want to write an equation which looks very neat and clean in such a complex looking form)
and the cosine and sine of any angle cannot be greater than 1 or less than -1.
there are several ways to split up 165
1. 165 = 180 - 15
2. 165 = 90 + 75, but 75 = 45 + 30
unless I misses an obvious combination, it looks like you have do this in 2 steps
third question is correct, if you follow the formula
(don't know why anybody would want to write an equation which looks very neat and clean in such a complex looking form)
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.