Question
Wed June 01, 2011 By:

dear sir shanker, i just could'nt understand in the third part of normal and gen form of line when you say in triangle omb and omc why does cosw become = p/a and sinw = p/b could you pl explain

Expert Reply
Thu June 02, 2011
Here OMB is an right angle triangle with acute angle w, therfore by trigonometric ratio:
 
Also in right angle triangle OMA, angle MOA is 90-w,
therefore,
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