**find the exact value of sin u/2 given cos u = 12/13 where**

apply a sum or defference identity to find the exact function value of cos(13pi/12)... First, find cos15° using the fact that 15° = 45° - 30°. then use a half angle identity to find cos7.5°.

**How do you find the exact values of cos pi/8 using the**

16/03/2013 · Find the first term, the common difference, and tn for a series having Sn = 5n^2−n.? The first term of an arithmetic series is 2 and the sum of the first 15 terms is 292.5. Find …... 31/03/2014 · Plz answer ASAP Yahoo India Answers Sign in Mail ⚙ Help

**Find the exact value of cos (7pi/12)? Yahoo Answers**

16/09/2017 · CORRECTION: at the end I forgot to divide by 2 both sides. Ans: cos^2(pi/8) = (sq rt 2 + 2)/4 Thanks to Herbert for pointing that out. Appreciate it. warframe how to go into dojo Get an answer for 'Find the exact value of cos pi/16' and find homework help for other Math questions at eNotes

**trigonometry Find the exact value of $\cos[\arcsin**

25/03/2002 · Date: 03/24/2002 at 15:41:35 From: Matthew Gallaher Subject: The exact value for cosine 20 degrees I have tried to find the exact value of cosine 20 degrees but have not been able to come up with a solution. I tried to take a third of the exact value of Cosine 60 degrees but that did not work. I how to find out macbook pro model Precalculus. Find the Exact Value cos(pi/8) Since is not an angle where the values of the six trigonometric functions are known, try using half-angle identities. is not an exact angle. First, rewrite the angle as the product of and an angle where the values of the six trigonometric functions are known. In this case, can be rewritten as . Use the half-angle identity for cosine to simplify the

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### Find the exact value of cos (7pi/12)? Yahoo Answers

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- Find the exact value of cos (7pi/12)? Yahoo Answers
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## How To Find The Exact Value Of Cos Pi 24

Find the exact value of $\cos[\arcsin(-\frac{1}{3})]$ Ask Question 1 $\begingroup$ This is for my homework and I don't know how to approach it to get an exact value. Given that $- \frac{\pi}{2} \le \arcsin x \le \frac{\pi}{2}$, find the exact of $\cos[\arcsin(-\frac{1}{3})]$. trigonometry. share cite improve this question. edited Feb 16 '13 at 21:28. Zev Chonoles. 110k 16 226 423. asked

- 5/12/2011 · Find the exact value of cos pi/16? I don't understand it... i know i'm suppose to use the half angle formula twice, but i can never seem to get the right …
- Precalculus. Find the Exact Value cos(pi/8) Since is not an angle where the values of the six trigonometric functions are known, try using half-angle identities. is not an exact angle. First, rewrite the angle as the product of and an angle where the values of the six trigonometric functions are known. In this case, can be rewritten as . Use the half-angle identity for cosine to simplify the
- If possible, find the exact value. a. b. c. Solution: a. Because for , . Other Inverse Trigonometric Functions The cosine function is decreasing and one-to-one on the interval 0 x . On the interval 0 x the cosine function has an inverse function—the inverse cosine function: y = arccos x or y = cos –1 x. cos x has an inverse function on this interval. 13 Other Inverse Trigonometric
- The conversion ratio between degrees and radians is #180/pi#. #pi/4 xx 180/pi = 45^@# Now, we must think of the special triangle that contains a #45^@# angle.