Question

answer it properly plz

Answer 1

If cos (a + b) = 0, then (a + b) can either be 90 degrees or 270 degrees.

However, the overall total of a triangle's angles is 180 degrees, so all angles should be less than 180 degrees.

sin (a + b) = sin 90 = 1

Answer 2

sin (a+b)=sin90=1
so value of sin (a +b)=1



hope it's help for you