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January 30, 2015

January 30, 2015

Posted by **Carry** on Monday, March 2, 2009 at 1:33pm.

sin 23pi/12

i got totally the wrong answer how do i approach this?

- TRIG -
**drwls**, Monday, March 2, 2009 at 1:45pmThat is pi/12 less than 2 pi (360 degrees), which would be 345 or -15 degrees. The sin of that angle is -0.2588

If you don't want the decimal approximation, it is

-sin(45 - 30) = -sin 45 cos 30 + sin 30 cos 45 = (sqrt 2)/2*[1/2 - (sqrt3)/2]

= (sqrt2)/4 -(sqrt6)/4

- TRIG -
**Carry**, Monday, March 2, 2009 at 2:22pmhaha i got that too! but the right answer is

(-root(2-root(3)))/2

- TRIG -
**Reiny**, Monday, March 2, 2009 at 2:49pmwhy don't you evaluate your "right" answer and compare it with drwls answer ?

MMMhhh ??

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