Question

If tan(a+b)=1 and cos a=1.find sinkb

Answer 1

cos a = 1

cos 0° = 1

So, a = 0

tan(a + b) = 1

tan 45° = 1

So, a + b = 45°

=> 0 + b = 45°

=> b = 45°

sin b = sin 45°= 1/√2