Ajutati-ma va rog frumos!! MULTUMESC MULT :d


1. Aflati valoarea de adevar a urmatoarelor propozitii :

a) (sin60 grade + cos60 grade) : (tg30 grade + tg 45 grade) =...


b) (cos45- grade - cos 30 grade ) ·(sin45 grade + cos30 grade ) =...



c)

d)








1

Răspunsuri

2014-05-25T14:55:07+03:00
A) (√3/2+1/2):(√2/2+1)=(√3+1)/(√2+2)
b) 
(√2/2-√3/2).(√2/2+√3/2)=(√2/2)²-(√3/2)²=2/4-3/4=-1/4