Question

How do you find the value of the function `sin ((9pi)/7)`?

Answer 1

• 0.78

Explanation:

`sin ((9pi)/7) = sin ((2pi)/7 + pi) = - sin ((2pi)/7)`
`(2pi)/7 --> 360/7 = 51^@43`
Calculator --> sin 51.43 = 0.78
There for:
`sin ((9pi)/7) = - 0.78`.