Question

if triangle ABC is a right angle at c then what is cos A + B​

Answer 1

Answer:

Step-by-step explanation:

We know that a ""right angled triangle"" is a triangle in which one angle is “90°”

Given: ABC is a right angled triangle,  

             i.e. A+B +C = 90⁰,                                                                  

Therefore A + B =180⁰ -C,

                          =180⁰- 90⁰,

A +B=90⁰,

Adding Cos on both the sides [In a right angled triangle the ""cosine or cos of an angle"" is the length of side which is adjacent divided by the length of hypotenuse],

Cos(A + B)=Cos(90⁰),

              =0,

HOPE IT HELPS YOU.