Question

Sin(pi/15)Cos(4pi/15)+Cos(pi/15)Sin(4pi/15)

Answer 1

this is the addition angle formula for sine
since \[\frac{1}{15}+\frac{4}{15}=\frac{5}{15}=\frac{1}{3}\]
your answer is
\[\sin(\frac{\pi}{3})\]

Answer 2

Why can you just drop the pi?

Answer 3

i didn't drop the \(\pi\) it is right here in
\[\sin\left(\frac{\pi}{3}\right)\]

Answer 4

oh, okay! Thank you!