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Problem
Problem
If in a
△
A
B
C
\triangle ABC
△
A
B
C
,
a
2
−
b
2
a
2
+
b
2
=
sin
(
A
−
B
)
sin
(
A
+
B
)
\frac{a^2 - b^2}{a^2 + b^2} = \frac{\sin(A-B)}{\sin(A+B)}
a
2
+
b
2
a
2
−
b
2
=
s
i
n
(
A
+
B
)
s
i
n
(
A
−
B
)
, then the triangle is a. Right angled or isosceles b. Right angled and isosceles c. Equilateral d. None of these
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