Go to the home page
Make sure the calc is set to degrees, there is a toggle button in the bottom left corner.
and write in (you don't need to use the buttons unless you want to, you can enter from you keyboard)
asin(9*sin(81)/11) then hit enter
That should give you the answer that you need.
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If you would rather press buttons it is
2nd sin (9*sin(81)/11) press enter (Ive heard the equal sign isn't working)
Go to the home page
Make sure the calc is set to degrees, there is a toggle button in the bottom left corner.
and write in (you don't need to use the buttons unless you want to, you can enter from you keyboard)
asin(9*sin(81)/11) then hit enter
That should give you the answer that you need.
------------------------------------------
If you would rather press buttons it is
2nd sin (9*sin(81)/11) press enter (Ive heard the equal sign isn't working)