Respuesta :
The principal value of arc sin(0.98)=78.5°.
What is principal value?
The value of the inverse function at a place that falls within the range of the unit of the principal value is the primary value of the trigonometric function at that point.
Trigonometric function solutions with a value between 0 and 2π are known as principal values of trigonometric functions. The primary values of trigonometric functions are values smaller than 2π, which is the interval at which the trigonometric function's value repeats.
The principal value of the inverse trigonometric function is always the positive value whenever any positive value and the negative value are presented in a way that these two values are equal.
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