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It seems that you are trying to calculate the inverse sine (arcsine) of 90. However the domain of definition of the arcsine function is the closed interval [-1, 1]. Any value outside of this interval will result in an error.
Both answers are correct. Arcsine is a periodic function with period 2pi. If you add 2pi to -1.31 you'll get 4.97 .If you define the primary domain to be from -pi to +pi then the first answer is correct. If you define the primary domain to be from 0 to +2pi then the second answer is correct.
I think you may find arcsin(x) is equivalent in older nomenclature to sin^-1 (x)...ie use the "2nd" and the SIN key instead of typing arcsin.
eg. arcsin(0.5) is 30 degrees is the same as sin^-1(0.5)
The ^-1 does not mean reciprocal, but "the angle whose sin is." Here the minus one indicates a kind of inverse operation. The word arcsin indicates that same inverse.
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