यदि \( A + B + C = 180^\circ \) भए प्रमाणित गर्नुहोस् । If \( A + B + C = 180^\circ \) , then prove that: \( \cos^2\frac{A}{2} + \cos^2\frac{B}{2} +…
SEE Class 10 Optional Maths · 2082 · Solved Question with Answer
यदि\( A + B + C = 180^\circ \) भए प्रमाणित गर्नुहोस् ।
If \( A + B + C = 180^\circ \), then prove that:
\( \cos^2\frac{A}{2} + \cos^2\frac{B}{2} + \cos^2\frac{C}{2} = 2 + 2\sin\frac{A}{2} \cdot \sin\frac{B}{2} \cdot \sin\frac{C}{2} \)