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find sin(theta), cos(alpha), theta, alpha from picture w/ pt  TOPIC_SOLVED

I've got a picture of a unit circle with an angle theta and an angle alpha but the angles are not given. There are 2 points on the circle. Theta goes through the point (-0.985, -0.174) and alpha goes through the point (0.940, -0.342) I need to find the sine of theta and the cosine of alpha. I also n...
by theshadow
on Sun Feb 22, 2009 11:15 pm
 
Forum: Trigonometry
Topic: find sin(theta), cos(alpha), theta, alpha from picture w/ pt
Replies: 2
Views: 3927

if the cos inverse of x=pie/3 what is the sin inverse of x ?  TOPIC_SOLVED

if the cos inverse of x= pie/3 what is the sin inverse of x ?
by theshadow
on Wed Feb 25, 2009 6:42 pm
 
Forum: Trigonometry
Topic: if the cos inverse of x=pie/3 what is the sin inverse of x ?
Replies: 4
Views: 6871

Re: if the cos inverse of x=pie/3 what is the sin inverse of x ?  TOPIC_SOLVED

cos((pi)/3) = 1/2, so i'm just taking sin inverse of 1/2?
by theshadow
on Wed Feb 25, 2009 11:22 pm
 
Forum: Trigonometry
Topic: if the cos inverse of x=pie/3 what is the sin inverse of x ?
Replies: 4
Views: 6871

one side of a triangular log has a length of 100 feet  TOPIC_SOLVED

one side of triangelar lot has a length of 100 feet; the angle opposite that side is 55 degrees. another angle is 63 degrees. how much fence will be needed to enclose the lot? i am having trouble figuring out which angle goes where and if i should use Cos or Tan
by theshadow
on Thu Feb 26, 2009 2:31 pm
 
Forum: Trigonometry
Topic: one side of a triangular log has a length of 100 feet
Replies: 4
Views: 2925

Re: one side of a triangular log has a length of 100 feet  TOPIC_SOLVED

i did 180-55-63=62 then 100/sin55=x/sin63=y/sin62 so x=108.8 y=107.8

is it ok that their about the same?
by theshadow
on Fri Feb 27, 2009 5:29 pm
 
Forum: Trigonometry
Topic: one side of a triangular log has a length of 100 feet
Replies: 4
Views: 2925

if tan(theta) = 1/2, find sin(theta) using trig identities  TOPIC_SOLVED

"If tan(theta) = 1/2, find sin(theta) using trig identities."

I know how to do this with triangles: use pyth. thm to find the hypotenuse, and read off the answer. But what identity should I use?
by theshadow
on Sun Mar 01, 2009 10:15 pm
 
Forum: Trigonometry
Topic: if tan(theta) = 1/2, find sin(theta) using trig identities
Replies: 4
Views: 19861

Re: simplify the sums, add two more lines, make a conjecture  TOPIC_SOLVED

1 = 1^3
8 = 2^3
27 = 3^3
64 = 4^3

1 = 1^2
9 = 3^2 (3 = 1 + 2)
36 = 6^2 (6 = 1 + 2 + 3)
100 = 10^2 (10 = 1 + 2 + 3 + 4)
by theshadow
on Fri Mar 06, 2009 1:33 pm
 
Forum: Discrete Math
Topic: simplify the sums, add two more lines, make a conjecture
Replies: 3
Views: 1976
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