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Mathematics
Problem
Two non-zero vectors
P
⃗
\vec P
P
and
Q
⃗
\vec Q
Q
make an angle of
120
∘
120^{\circ}
12
0
∘
with each other. The scalar projection of
P
⃗
\vec P
P
on
Q
⃗
\vec Q
Q
is a)
+
P
cos
60
∘
+\;P\cos60^{\circ}
+
P
cos
6
0
∘
b)
+
P
cos
120
∘
+\;P\cos120^{\circ}
+
P
cos
12
0
∘
c)
−
P
cos
120
∘
-\;P\cos120^{\circ}
−
P
cos
12
0
∘
d)
0
0
0
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