precalc
posted by Kim .
find the exact value of the given expression. Thank you!
tan(1/2cos^1(9/10)

tangent of 1/2 the angle whose cosine is 9/10
Exact value? What is wrong with a calculator? Paste this into your google search window...
tan(.5*arccos(9/10))=
Is that exact enough? It appears to be an irrational number. 
find the exact value of (5pie/8)
Respond to this Question
Similar Questions

Pre Calc.
Use the sum or difference identity to find the exact value of sin255 degrees. My answer: (sqrt(2) sqrt(6)) / (4) Find the value of tan (alphabeta), if cos alpha= 3/5, sin beta= 5/13, 90<alpha<180, and 90<beta<180. My … 
Math
Use an addition or subtraction formula to write the expression as a trigonometric function of one number, and then find its exact value. (tan(π/2)+tan((2π)/3)) / (1tan(π/2)tan((2π)/3)) Answer=__________ Exact value … 
MATHEMATICS
Given that Sin(A+B)=2Cos(AB) and tan A = 1/3 , Find the exact value of tan B. 
mathematics
Given that Sin(A+B)=2Cos(AB) and tan A = 1/3 , Find the exact value of tan B. 
trig
please help me with some questions I skipped on a review for our test coming up? 
Math
1. Find the exact value of 2tan pi/12 / 1tan^2 pi/12 root 3/3? 
Math (Precalc)
I need to know how to solve this for my review questions. Thanks! The wheel on a racing bike have a radius of 14 in. How fast is the cyclist traveling in mph if the wheels are turning at 280 revolutions per minute. find the exact value … 
PreCalc
I do not know which value I am solving for or how to get there these are the instructions and info given. Use the given conditions to find the exact value of the expression. sinx=(5/13), tanx>0, sin(x(pi/3)) There is no question … 
PreCal
Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. (tan(74°)tan(14°))/(1+tan(74°)tan(14°)) =__________ Find it's exact value (not decimal form) =__________ Note: A similar … 
calculus
Find the exact value of the given expression. (tan17pi/12  tan pi/4) / (1+tan 17pi/12 tan pi/4) can you help with this?