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find the dot product v⋅w: for v=i-j, w=i+j

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\[\mathbf{v}\cdot\mathbf{w}=\langle 1,-1\rangle\cdot\langle 1,1\rangle\]\[=1(1)+-1(1)=0\]
do you know how i would find the angle to that?
plot those two vectors onto a graph.

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Other answers:

ok and find the missing angle?
you can also use is the fact that for two vectors with magnitudes \(a\) and \(b\), with angle \(\theta\) between the two vectors, the dot product is\[\mathbf{a}\cdot\mathbf{b}=ab\cos{\theta}\]
so \(0=\cos{\theta}\)
ok thats simple
thanks bro

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