The vectors a and b are defined by a =1. b = . where reR. (a) Find and simplify an expression for a · b in terms of r. (b) Hence or otherwise, find the values of 1 for which the angle between a and b is obtuse.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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The vectors a and b are defined by a =
where teR.
41
(a) Find and simplify an expression for a ·b in terms of r.
(b) Hence or otherwise, find the values of i for which the angle between a and b is obtuse.
Transcribed Image Text:The vectors a and b are defined by a = where teR. 41 (a) Find and simplify an expression for a ·b in terms of r. (b) Hence or otherwise, find the values of i for which the angle between a and b is obtuse.
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