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Mathematics
OpenStudy (anonymous):

Let a and b be nonzero vectors. Show that projb a is perpendicular to a - projb a. (Note: The b is the subscript of proj.)

OpenStudy (watchmath):

are these vectors on the plane ?

OpenStudy (anonymous):

Yes

OpenStudy (watchmath):

ok, do you remember the formula of projb a in terms of a and b?

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