Question

A=iAcosx+jBsinx how to find perpendicular to this vector?

Answer 1

Answer:

-i B sin x + j A cos x

Step-by-step explanation:

In general, given any point ( a, b ) in the plane, rotating this 90 degrees anticlockwise around the origin takes it to ( -b, a ).

So the vector

-b i + a j

is perpendicular to the vector

a i + b j