Question

o valor de cos 180 graus - sen 270 graus + cos150 graus + sen225 graus é :

Answer 1

cos180=-1
sen270=-1
cos150=-√3/2
sen225=-√2/2

cos 180 graus - sen 270 graus + cos150 graus + sen225 graus é 
-1-(-1)+(-√3/2)+(-√2/2)
=-1+1-√3/2 - √2/2
=(-√3-√2)/2