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This says that we wish to find an angle whose sin = 7/15. We can use the arcsin function for this.

arcsin is the same a inverse sign. You have to use one of these when you are finding an ANGLE.

asin (7/15) =
or
sin ^-1(7/15) =

If you want the angle in degrees, make sure your calc is set to degrees. If you are using a hand held calc, there will probably be a tiny D at the top of the screen.