Posted by **Sejul** on Wednesday, March 30, 2011 at 8:42pm.

For which angles beta, with 0 degrees less than/equal to beta less than/equal to 180 degrees,

is sin 3beta equal to -1?

a) 30 degress and 150 degrees

b) 60 and 120 degrees

c) 90 degrees

d) 0 and 120 degrees

I think it is C because sin of (3 x 90 = 270) 270 degrees is -1?

Did I do this right? Or did I do something that cannot be done?

Thank you.

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