tg( π/4) = 1 sin(π/4) = √2/2 cos(π/4)= √2/2 sin(-2π/3)=-√3/2 cos(-2π/3)=-1/2
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tg( π/4) = 1 sin(π/4) = √2/2 cos(π/4)= √2/2 sin(-2π/3)=-√3/2 cos(-2π/3)=-1/2