Posted by **Kelly** on Monday, March 14, 2011 at 5:24pm.

Find the exact value of Sin^-1(sin(13pi/15))

- Math -
**Reiny**, Monday, March 14, 2011 at 6:11pm
ummmhhh, wouldn't that just be 13π/15 ?

or, since the sine is + in both the 2nd or 1st quadrant, and

since 13π/15 is in quadrant II we could also have

π - 13π/15 = 2π/15

check with calculator, set to radians

enter:

13

x

π

÷

15

=

sin

=

2nd sin

= .41887902 which is 2π/15

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