Question

Angle a and angle b are acute angles and cos a=cos b find angle a and b

Answer 1

CosA = cosB is sin(90-a)=sin(90-b)

implies 90-a=90-b

hence A=B......alternately construct a right triangle with A B and C as its right angled vertex ...and find cos a= cos b u will get AC=BC

which implies A=B