Respuesta :

We have the following rule:
[tex]cos (ghi)= \frac{gh^2+ih^2-gi^2}{2(gh)(ih)}\\= \frac{25^2+25^2-30^2}{2\times25\times25}=0.28 [/tex]
In order to find the sine, simply do like this:
[tex]sin(ghi)=\sqrt{1-0.28^2}=0.96[/tex]

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