Exercitiul 6, multumesc!

Exercitiul 6 Multumesc class=

Răspuns :

sin(10)+sin(30)-sin(170)
[tex]cos(90-10)+ \frac{1}{2} -cos(90-170)[/tex]
[tex]cos(80)+ \frac{1}{2} -cos(80) = \frac{1}{2} [/tex]