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Mathematics
Mathematics
Problem
If
∣
a
+
b
∣
>
∣
a
−
b
∣
|\mathbf{a} + \mathbf{b}| > |\mathbf{a} - \mathbf{b}|
∣
a
+
b
∣
>
∣
a
−
b
∣
, then the angle between
a
\mathbf{a}
a
and
b
\mathbf{b}
b
is a. acute b. obtuse c.
π
/
2
\pi/2
π
/2
d.
π
\pi
π
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