+118723 what is sin-1(8)?
I assume that you mean the inverse sine of 8.
So you want to know the sine of what angle = 8
In a right angled triangle sine is opp/hyp and the opp has to be smaller than the hypotenuse so sine of the angle must be less than 1.
If we are not talking about a right angled triangle the sine of any angle must still be between ( and including ) -1 to 1.
8 is not between -1 and 1 so there are no solutions.
