Question

If ABC is right angled at C, then the value of cos(A+B)is​

Answer 1

Answer:

This is right angled at c so,

Step-by-step explanation:

Cos(a+b)

=cos90(x+y)

X=Y

So, cos90(x+x)

=cos90(2x)

Answer 2

Step-by-step explanation:

ABC is right angled at C.

So,

C = 90° and (A+B )= 90°

We know that,

Cos90°= 0

Cos(A+B)

= Cos90°

= 0 [ Ans]