Math
posted by David M. .
Use a half angle formula to determine the exact value of sin 7(pi)/12.

Math 
Damon
well, 7 pi/6 is 180 + 30 degrees
and 7 pi/6 = twice 7 pi/12
we know sin and cos of 7 pi/6
sin 7 pi/6 = 1/2
cos 7 pi/6 = (1/2)sqrt3
so now you should be able to find the sin of 7 pi/12
Respond to this Question
Similar Questions

Math
Use the half formula to find the exact value of the expression sin 22.5 
Calculus
I had this on a test: Use the halfangle formula to find the exact value of the expresseion: sin 22.5 degrees my answer  1/2 sqrt2  sqrt 2 was wrong 
Math (Calc)
Find the Exact value of Pi/24. I'm not sure whether to use a halfangle formula or a difference/sum of angles formula. 
precal
use the half angle formula to determine the exact values of sin, cos, and tan of the angle. pie/8 and pie/12 
MATH
1.)Find the exact solution algebriacally, if possible: (PLEASE SHOW ALL STEPS) sin 2x  sin x = 0 2.) GIVEN: sin u = 3/5, 0 < u < ï/2 Find the exact values of: sin 2u, cos 2u and tan 2u using the doubleangle formulas. 3.)Use … 
Pre calc
Use the halfangle formulas to determine the exact values of the sine, cosine, and tangent of the angle. 67° 30' 7 sin(67° 30')= cos(67° 30')= 4 tan(67° 30')= 
Trig
How do i find the exact value of sin 15 using the half angle formula 
Math Trig
1. Determine the exact value of cos^1 (pi/2). Give number and explanaton. 2. Determine the exact value of tan^1(sq. root 3). with explanation. 3. Determine exact value of cos(cos^1(19 pi)). with explanation. 4. Determine the exact … 
Math Help
Hi! Can someone help check this for me and see if I'm doing it right? 
Math
cotθ=3, cos<0. Find the exact value of sin θ/2 using halfangle formula. Please help!