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trig

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I have to retype this.

For which angles theta,
with 0 degrees less than/equal to theta less than/equal to 180 degrees, is sin 3theta = (equal) -1 (negative 1)?

a) 30 and 150 degrees
b) 60 and 120 degrees
c) 90 degrees
d) 0 and 120 degrees

How do I set this up?

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