Question

If ∆ABC is right angled at B, what is the value of sin (A + C)

Answer 1

In triangle ABC ,

the angles are A, B and C

By Angle sum property,

• A + B + C = 180
• A +90 +C =180
• A + C =90

I. e,

sin(A+C) = sin(90) =1

so, sin (A+B) = 1