Question

Cos(Π/4+A).Cos(Π/4-B)-Sin(Π/4+A).Sin(Π/4-B)=Sin(B-A)

Answer 1

Step-by-step explanation:

cos 45 cos A-sin 45 sin A.cos45 Cos B+ sin 45 sin B-(sin 45 cos A +cos 45 sinA).(sin 45 cos A-cos 45 sin A)

1/√2(Cos A-sin A)1/√2(cos B - sin B)-1/√2(cos A + sin A)1/√2(cos A - sin A)