Question

Cos(A-B)=cosAcosB + sinAsinB hence deduce that Sin²A+Cos²A=1

Answer 1

Answer:

Does the formula cos(A-B) = cosA cosB + sinA sinB deduce that cos^2 A + sin^2 B? ... cos(A-B)=cos A cos B+sin A sin B. now, ... Since , cos 0 = 1 , therefore

HOPE this helps you please mark me as brain