Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
MediumIf in a triangle $ABC$,$a, b, c$ are sides and angle $A$ is given,and $c \sin A < a < c$,and $b_1$ and $b_2$ are two possible values of $b$,then:
- A$b_1 + b_2 = 2c \cos A$
- B$b_1 + b_2 = c \cos A$
- C$b_1 + b_2 = 3c \cos A$
- D$b_1 + b_2 = 4c \sin A$
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