In the video where you explained the formula of sin(x+y)the angle CBA is not equal to x. It is commoning y can you explain the angle of CBA

Asked by  | 20th Jul, 2012, 09:07: PM

Expert Answer:

 
Since BE is perpendicular to OD, so angle BEO is 90 degrees.
So, in triangle POE, angle OPE = 90 - x (using angle sum property)
 
So, angle CPA is also 90 - x (vertically opposite angles)
 
In right triangle APB, by angle sum property, we get,
angle ABP = x
That is, angle CBA = x

Answered by  | 24th Jul, 2012, 04:59: PM

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