Question

Notam cu x masura unui ungimhi ascutit.Daca:
a)cos x=4/5,aflati sin x.
b)sin x=1/3,aflati cos x.
c)cos x= radical 7/4,aflati in x.
d)sin x=radical 2/3,aflati cos x.

Answer 1

sin^2 +cos^2 = 1
a) cosx=4/5 -> sinx^2= 1 - cosx^2 -> sinx = rad(1-(4/5)^2) = 3/5
b) sinx=1/3 => cosx^2=1 - sinx^2 -> cosx = rad(1-(1/3)^2) = (2rad2)/3
Restul le faci singura