Известно, что
[tex]sin ( \pi - \alpha )= \frac{ \sqrt{2} }{2} [/tex]
найдите [tex]cos2 \alpha [/tex]
[tex]sin ( \pi - \alpha )= \frac{ \sqrt{2} }{2} [/tex]
найдите [tex]cos2 \alpha [/tex]
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Answers & Comments
sin(pi/4)=sqrt(2)/2⇒a=pi/4
cos(2pi/4)=cos(pi/2)=0