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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.)
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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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