Math
posted by Kelly .
Find the exact value of Sin^1(sin(13pi/15))

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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