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Question

The component of a vector a along and perpendicular to a nonzero vector b is:

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Solution

OA=a and M is the foot of perpendicular on OB.
The scalar component of a along b=OM
=acosθ
=a.bb
The scalar component of a perpendicular to b=AM
=asinθ
=a×bb
The vector component of a along b=OM
=OMbb
=(a.b)bb.b
The vector component of a perpendicular to b
MA=OAOM
=a(a.b)b(b.b)
=b×(a×b)b.b

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