Solve the problem.The unit vectors u and v are combined to produce two new vectors
and
Show that a and b are orthogonal. Assume 
What will be an ideal response?
u = ux i + uyj and v = vx i + vyj , so
a = u + v = (ux + vx) i + (uy + vy)j and b = u - v = (ux - vx) i + (uy - vy)j
Take the dot product a ? b:
a ? b = (u + v) ? (u - v) = (ux + vx)(ux - vx) + (uy + vy)(uy - vy)
= -
+
-
= (
+
) - (
+
)
= -
= 1 - 1 = 0
Since the dot product of the two non-zero vectors is zero they are orthogonal.
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