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

  • Math -

    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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