Is anybody who can explain the proof of cosine law here?
Take a triangle OAP. Pick your coordinate system such that O is at the origin and A is on the x-axis. Let P have coordinates (x,y) and let |OA|=a, |OP|=b and |AP|=c. Let [itex]\theta[/itex] be the angle between OP and the x-axis.
Express x and y in terms of [itex]\theta[/itex] and compute c using the pythagorean theorem.
ohh thanks a lot.It was easy.
Or you can dram triangel ABC, then you dram the attitude from A then you use pythagore theorem with AB, and AC then you can figure out.
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