Question

If A+B=180° then find the value of cosA+cosB​

Answer 1

Let B = 180° - A.

Then,

cos A + cos B

= cos A + cos (180° - A)

= cos A - cos A [because cos (180° - x) = - cos x]

= 0

Answer 2

Answer:

0

Step-by-step explanation:

Given

A+B=180°

let

B=180°-A

then

cosA+cosB

cosA+cos(180-A)

cosA-cosA

=0