Question

find the value of the function sin 9pi/7

Answer 1

\[\sin(\frac{ 9 }{ 7 }\pi)= -\sin(\frac{ 2 }{ 7 }\pi)\]

Answer 2

How are you supposed to find it? Can't you use a calculator? Or a table?

Answer 3

i need it not in fractions, but decimals
:/

Answer 4

lets assume i know NOTHING about trig and im being asked this question.

Answer 5

well then we need to start explaining about the unit circle and what sin is

Answer 6

i know the unit circle i just... dont know how to apply it

Answer 7

i do it on my calculator and get "-0.7818"

Answer 8

you need degrees?

Answer 9

or radians?

Answer 10

\(\pi\) radians = 180 degrees

Answer 11

so
\[\sin(\frac{ 9 }{ 7 }\pi) \rightarrow \sin(\frac{ 9 }{ 7 } \times 180)\]

Answer 12

−0.781831482

Answer 13

but often calculators have an option to use radians instead of degrees

Answer 14

Your answer was correct