Calculator will not find the f@#$'in inverse sine

[Big Karl 0]

My Casio fx-9750 GIl gets an "Ma error" if say I plug in sin^-1 8/15. Is there any solution? Can I do it without a calculator?

 

Actually I plugged in .53 instead of 8/15, problem solved.

[CaptainPanic 1159]

problem solved.

Hope this doesn't sound rude, but why did you hit the "post" button, instead of canceling the thread?

[alpha2cen 18]

My Casio fx-9750 GIl gets an "Ma error" if say I plug in sin^-1 8/15. Is there any solution? Can I do it without a calculator?

 

Actually I plugged in .53 instead of 8/15, problem solved.

 

Draw rectangular triangle which contains base length is sqrt(15²-8²), height 8

and measure the angle by using an angle mater.