Class 11MathematicsTrigonometrical EquationsMix Examples-Trigonometrical Equations and Inequations, Properties of Triangles, Height and Distance
EasyIn $\Delta ABC$,find the value of $\frac{1}{a}\cos^2\frac{A}{2} + \frac{1}{b}\cos^2\frac{B}{2} + \frac{1}{c}\cos^2\frac{C}{2}$.
- A$s$
- B$\frac{s}{abc}$
- C$\frac{s^2}{abc}$
- D$\frac{s^3}{abc}$
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