[نهـــى]

53

cos x=√3/2=5π/6
sin x =1/2=(5π/6,&,π/6
cos x=0=π/2
cos1/√2=!!!!!!!!!!!
sin x =-√3/2
hadi makanech psq 9al men (0.π) w fe hadi l7ala sin ykoun mojab ^^