Asked by Stayc

Use compound angle formulas to evaluate

a) cos(pi/12)

b) sin(pi/12)

c) tan(5pi/12)

d) sin(11pi/12)
Answered by oobleck
just apply the half-angle formulas.
Post your work if you get stuck.
Answered by winter
for the first one i got [sqrt(2)(1+sqrt(3))]/4 . can i simplify this further?
Answered by oobleck
not really. I might say
(1+√3)/√8 or (1+√3)/(2√2)
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