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Sep4-08, 11:34 PM
P: 26
A) Find the unit vector parallel to tan(x) at (Pi/4, 1)

B) Find the unit vector normal to tan(x) at (Pi/4, 1)

dy/dx tanx = sec2x and sec2x evaluated at x = Pi/4 is 2. So the slope of the parallel line is 2, but how do I then derive the unit vector?
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