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Hey i was wondering what you guys do in preparation for studying? i have the essentials, like a packet of chips for snacking, a bottle of water, and headphones for music (i study so much better with music) and skype (me and my cousin talk to each other in order to motivate each other and keep...

Hey i was just wondering how you would derive the hyperbola formula. This is how i derived the ellipse formula: Ellipse with major axis (x) 2a and minor axis (y) 2b, center (0,0) point A(a,0) is at extremity of major axis, B(0,b) is extremity at minor axis Point S (k,0) and S'(-k,0) where 0<k<a...