So you thought I was done with my mathematics questions. heheheh ;0)

my book doesn't have the answer, and wanted to know if i was correct.

Original Question:

Tan ((17*pi)/3)

Work:

((17*pi)/3)*(180/pi)=1020 degrees //convertion to degrees

1020 - 360 - 360 = 300 degrees

reference angle -60 -> sin (60) = -sqrt(3)/2 -> cos (60) = 1/2

Tan = sin/cos = (-sqrt(3)/2)*(2/1) = -sqrt(3)

Check:

Tan-1 (-sqrt(3)) ~ -1.0471975512

-1.0471975512 * (180/pi) = -60 degrees

Is this valid? I'm assuming yes.

Please, one of you wonderful smart math guru, provide me some input.

Thanks.