известно,что cos(pi/6 + t)+ cos(pi/6 - t)=p. Найдите cos(pi/6 + t)+ cos(pi/6 - t). Created by 55121997. algebra-ru

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известно,что cos(pi/6 + t)+ cos(pi/6 - t)=p. Найдите cos(pi/6 + t)+ cos(pi/6 - t)

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lNT64 $cos \alpha +cos \beta =2*cos \frac{ \alpha + \beta }{2}*cos \frac{ \alpha - \beta }{2}$
$2*cos \frac{ \pi }{6} *cost=p$
$2* \frac{ \sqrt{3} }{2} *cost=p$
$cost= \frac{ \sqrt{3} }{3}p$

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