👤

Sin^2(110)+sin^2(200)

Răspuns :




sin110= sin(200 -90)= sin200cos90 - cos200sin90=cos200
sin^2(110)= cos^2(200)
cos^2(200) + sin^2(200) = 1
sin²(110) + sin²(200) =
= sin²(110) + sin²(90+110)=
= sin²(110) + cos²(110) =
= 1