3) 4 sin α = ? cos α = α ∈ (π; 3π/2) - 3-я четверть (sin α < 0)
sin α = - 0.125
4sin α = -0.5
4) 21 cos γ = ? sinγ = γ ∈ (3π/2; 2π) - 4-я четверть (cos γ > 0)
cos γ = 1/7
21 cos γ = 3
5) tg α = ? cos α = α ∈ (3π/2; 2π) - 4-я четверть (tg α < 0)
tg α = - 2.5
3) 4 sin α = ? cos α =
α ∈ (π; 3π/2) - 3-я четверть (sin α < 0)
sin α = - 0.125
4sin α = -0.5
4) 21 cos γ = ? sinγ =
γ ∈ (3π/2; 2π) - 4-я четверть (cos γ > 0)
cos γ = 1/7
21 cos γ = 3
5) tg α = ? cos α =
α ∈ (3π/2; 2π) - 4-я четверть (tg α < 0)
tg α = - 2.5