Question

Please can anybody solve this sum in a lucid (easy) method.

Answer 1

Consider a right angled triangle ,right angled at C
∴ Cos A = AC/AB
 Cos B = BC/AB
It is given that CosA = CosB
⇒AC/AB = BC/AB
AC=BC
By applying the property of angles opposite to equal sides are equal
∠A = B
Hence proved !!!



Hope it helps...:)