I know that $$E(\theta|k^2)=\int_0^\theta{\sqrt{1-k^2\sin^2\phi}}\,d\phi.$$
I want to find $E(k)$ where $k=0.36$.
With a website I computed it to be approximately $1.518$.
How can I find the answer without computer?
I know that $$E(\theta|k^2)=\int_0^\theta{\sqrt{1-k^2\sin^2\phi}}\,d\phi.$$
I want to find $E(k)$ where $k=0.36$.
With a website I computed it to be approximately $1.518$.
How can I find the answer without computer?
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