# Problem to calculate arcsin(5/24*cos(45)) to a real number

When I enter the expression `arcsin(5/24*cos(45))`

in a Jupyter Notebook
running the Sage kernel, I "only" receive `arcsin(5/24*cos(45))`

.

I want to have the expression as a real number, but I don't know how to tell Sage that I want this expression to be calculated.

You can use real numbers in the calculation to get a real number result, namely

`arcsin(5/24*cos(45.0))`

Welcome to Ask Sage! Thank you for your question.