Question

cos 255 degrees + sin 165 degrees equals to​

Answer 1

Answer:

sin 15+sin 15=0

Step-by-step explanation:

Cos255= cos (270-15) = -sin 15

Sin 165=sin (180-15)=sin15

So,

cos255+sin 165

=-sin15+sin15

=0

Answer 2

cos( 270-15)+sin( 180-15)

-sin15+sin15

=0