A) \[60{}^\circ \]
B) \[90{}^\circ \]
C) \[120{}^\circ \]
D) \[150{}^\circ \]
Correct Answer: C
Solution :
If a, b and c are the sides of a triangle and C is a largest angle, then Letthen \[\Rightarrow \,\cos C=-\frac{\sin \alpha \cos \alpha }{2\sin \alpha \cos \alpha }\]You need to login to perform this action.
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