Question

calculand valuarea expresiei E=sin x +cos (90 grade-x) pentru x=30 grade, vei obtine: A=0 B=1 C=radical din 3 D=radical din 2

Answer 1

E=sin30 + cos60=$\frac{1}{2} + \frac{1}{2}$=1(B)

Answer 2

E= sin 30 + cos(90-30) = sin 30 + cos 60= 1/2 + 1/2 =2/2 =1
B) 1