Homework; HELP! (1 Viewer)

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alussovsky

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How do you work out "cos(86°)=((hcot(9°))^2 + (hcot(12°))^2 - 600^2) / 2*hcot(9°)*hcot(12°)"? Thank you!
 
supR

supR

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Are you trying to apply the cosine rule for a 3D trig question? I'm lacking context, so I'm not sure how to help.
 
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