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Problem
Problem
In a
Δ
A
B
C
\Delta ABC
Δ
A
B
C
, if
4
cos
A
cos
B
+
sin
2
A
+
sin
2
B
+
sin
2
C
=
4
4 \cos A \cos B + \sin 2A + \sin 2B + \sin 2C = 4
4
cos
A
cos
B
+
sin
2
A
+
sin
2
B
+
sin
2
C
=
4
, then
Δ
A
B
C
\Delta ABC
Δ
A
B
C
is a. right angle but not isosceles b. isosceles but not right angled c. right angle isosceles d. obtuse angled
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