Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
DifficultIn a $\triangle ABC$,the expression $\frac{(a+b+c)(b+c-a)(c+a-b)(a+b-c)}{4b^2c^2}$ equals:
- A$\cos^2 A$
- B$\cos^2 B$
- C$\sin^2 A$
- D$\sin^2 B$
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With usual notation in a $\Delta ABC$,if $R = k \frac{(r_1 + r_2)(r_2 + r_3)(r_3 + r_1)}{r_1 r_2 + r_2 r_3 + r_3 r_1}$,where $k$ has the value equal to:
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