Question

यदि A+ B + C = [ भए प्रमाणित गर्नुहोस् ।
If A+B+C = Ttº, prove that:
cos 2A + cos 2B+ cos2C -(4 cos A. cos B. cos C+ 1)
15-20 मिटर अग्लो भवनबाट एउटा स्तम्भको टुप्पो र फेद हेर्दा अवनति​

Answer 1

Answer:

Step-by-step explanation:

Sorry I don't know in hindi

Answer 2

Answer:

$\sqrt{25} \times \sqrt{36} = \sqrt{25 \times 36}$