Cos(p/6+a)=Cos(p/6) * Cosa - Sin(p/6 )* sina = корень(3)/2 * Cosa - 1/2 * Sinaподставляй и получай
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Cos(p/6+a)=Cos(p/6) * Cosa - Sin(p/6 )* sina = корень(3)/2 * Cosa - 1/2 * Sina
подставляй и получай