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Problem
Problem
In a
Δ
A
B
C
\Delta ABC
Δ
A
B
C
,
2
cos
A
=
sin
B
sin
C
2 \cos A = \frac{\sin B}{\sin C}
2
cos
A
=
s
i
n
C
s
i
n
B
and
2
tan
2
B
2^{\tan^2 B}
2
t
a
n
2
B
is a solution of equation
x
2
−
9
x
+
8
=
0
x^2 - 9x + 8 = 0
x
2
−
9
x
+
8
=
0
, then
Δ
A
B
C
\Delta ABC
Δ
A
B
C
is a. equilateral b. isosceles c. scalene d. right angled
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