sin 30° cos 30°+2 sin 45° cos 45°- sin 60° cos 60°=
= 1/2×√3/2+2×√2/2×√2/2-√3/2×1/2=
=√3/4+2×2/4-√3/4=
=√3/4+1-√3/4=1
Răspuns:
Explicație pas cu pas:
sin 30° cos 30°+2 sin 45° cos 45°- sin 60° cos 60° =
1/2×√3/2+2×√2/2×√2/2-√3/2×1/2 =
√3/4+2×2/4-√3/4 =
√3/4+1-√3/4 = 1
