SOLUTION: Find the exact value of the expression
cos(pi/12)cos(3pi/4) - sin(pi/12)sin(3pi/4)
I appreciate your help!
Algebra.Com
Question 140797: Find the exact value of the expression
cos(pi/12)cos(3pi/4) - sin(pi/12)sin(3pi/4)
I appreciate your help!
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
cos(pi/12)cos(3pi/4) - sin(pi/12)sin(3pi/4)
=((sqrt(3)/2)(-sqrt(2)/2))-((1/2)(sqrt(2)/2))
=-sqrt(6)/4 - sqrt(2)/4
=
=-.965926
.
Ed
RELATED QUESTIONS
Find the exact value of cos(pi) cos(3pi/4) + sin(pi) sin... (answered by jim_thompson5910,MathTherapy)
Find exact value of
cos 3pi/4
sin... (answered by lwsshak3)
Which of the following has no solution?
A.Arc cos x=pi/12
B.Arc cos x=3pi/4
C.Arc... (answered by stanbon)
Find the exact value of sin^-1(cos... (answered by oscargut)
1. find the value of cos 7pi/6 sin 3 pi/4 + sin 7pi/6 cos 3pi/4
(answered by Alan3354)
Find the exact value of the expression:
sin (3pi/4) cos (5pi/6) - cos(3pi/4) sin... (answered by lwsshak3)
If sin(x)+cos(x) = -1/5, and 3pi/4 ≤ x ≤ pi, find the value of... (answered by Edwin McCravy,ikleyn)
Write the expression as a single real number. Do not use decimal approximations.
(answered by jim_thompson5910)
Please help me solve this equation;
I have to find the exact value of cos(13pi/12)
I... (answered by stanbon,Alan3354)