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Mathematics
Mathematics
Problem
In a
Δ
A
B
C
\Delta ABC
Δ
A
B
C
with usual notations, If
∠
A
=
55
∘
\angle A = 55^\circ
∠
A
=
5
5
∘
,
∠
B
=
15
∘
\angle B = 15^\circ
∠
B
=
1
5
∘
,
∠
C
=
110
∘
\angle C = 110^\circ
∠
C
=
11
0
∘
, then the value of
(
c
2
−
a
2
)
(c^2 - a^2)
(
c
2
−
a
2
)
equals (a)
2
a
b
2ab
2
ab
(b)
a
b
2
\frac{ab}{2}
2
ab
(c)
a
b
ab
ab
(d)
a
b
4
\frac{ab}{4}
4
ab
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