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.

## Answer This Question

## Related Questions

- trig - I have to retype this. For which angles theta, with 0 degrees less than/...
- Math - Solving Trig Equations - Solve each equation on the interval: 0 is less ...
- Calculus - Determine the measure of A if 0 degrees is less or equal to angle A ...
- trig - on the same set of axes: (0 degrees is greater than or equal to x and x ...
- Math - How do you express in terms of angles less than 90 degrees? sin 120 ...
- trig - How do you express in terms of angles less than 90 degrees? sin 120 ...
- math - solve the equation for the range zero degrees less than or equal to theta...
- Mathematics - If cosA is equal to 12/13 where 0 degrees is less than A less than...
- math - Draw the graph of Y=Sinx for 0 degrees less than or equal to x less than ...
- Math/Trig - Solve: 2 sin x - 1 = 0 for 0 degrees is less than or equal to x is ...

More Related Questions