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Тригонометр. Cos 2π/3. 3π/4. 5π/2.
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See also
Sin π 12 cos π 12
Sin π α ctg π α
Ctg 2 π 4
Sin π 8 sin π 4
Π связь и в молекулах
Sin π 6 sin π 7
T g x π
Sin2 π 3
Cosx 2x π
Sin 3π a cos π a
Тригонометр. Cos 2π/3. 3π/4. 5π/2. 