Images TG Π COS Π

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Tg π cos π. CTG. Cos 2π/3. Cos(3π/2-a) +cos(π+a) /2sin(a-π/2) cos(-a) +1. Cos^2(π+a)+cos^2(π/2-a).
CTG. Cos 2π/3. Cos(3π/2-a) +cos(π+a) /2sin(a-π/2) cos(-a) +1. Cos^2(π+a)+cos^2(π/2-a).

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