Photos 1 SIN 2A

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1 sin 2a. 1-Cos2a/1-sin2a. Sin 2 cos 2 формула. (1-Sin a)*(1+sin a)/cos -(a).
1-Cos2a/1-sin2a. Sin 2 cos 2 формула. (1-Sin a)*(1+sin a)/cos -(a).

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