Saturday

August 23, 2014

August 23, 2014

Posted by **Help** on Sunday, April 1, 2012 at 1:09am.

cos(pi/16)

- Trig -
**drwls**, Sunday, April 1, 2012 at 1:57amcos (x/2) = sqrt[(1/2)(1 + cosx)]

cos(pi/16) = sqrt[(1/2)(1 + cos(pi/8)]

cos(pi/8) = sqrt[(1/2)(1 + cos(pi/4)]

= sqrt[(1/2)(1 + sqrt2/2] = 0.92388..

cos(pi/16) = sqrt[(1/2)*1.92388]

= 0.980785..

Writing it in exact form would be a bit messy, but I hope you see how it can be done

**Related Questions**

MATH - 1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL ...

Mathmatics - a. Use the formulas for lowering powers to rewrite the expression ...

Please help Math - a. Use the formulas for lowering powers to rewrite the ...

TRIG/ALGEBRA - 1) Find the exact value. Use a sum or difference identity. tan (-...

Trignometry questions EASY HELP - 1. Which is a solution to the equation below? ...

Math- Trig - 1. Determine the exact value of cos^-1 (pi/2). Give number and ...

trig - Use half-angle formulas to find the exact value for the following cot 75 ...

trig - Use a half-angle formula to find the exact value of cos 5ð/12

trig - use a half angle formula to find the exact value of cos 75 degree

Pre calc - Use the half-angle formulas to determine the exact values of the sine...