I have to calculate this without using the calculator.(adsbygoogle = window.adsbygoogle || []).push({});

cos (arctan 5/12)

So far i draw a triangle and i have the opposite side to be 5, adjacent to be 12, and hypotenuse to be 13. Please suggest me some hint, thanks.

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# Homework Help: Trig problem cos (arctan 5/12)

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