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Mathematics
Mathematics
Problem
If the sides of a
Δ
A
B
C
\Delta ABC
Δ
A
B
C
are in AP and
a
a
a
is the smallest side, then
cos
A
\cos A
cos
A
equals a.
3
c
−
4
b
2
c
\frac{3c - 4b}{2c}
2
c
3
c
−
4
b
b.
3
c
−
4
b
2
b
\frac{3c - 4b}{2b}
2
b
3
c
−
4
b
c.
4
c
−
3
b
2
c
\frac{4c - 3b}{2c}
2
c
4
c
−
3
b
d. None of these
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