упростите выражение:
[tex] \cos(2 \alpha ) - \sin(2 \alpha ) \times \cot( \alpha ) [/tex]
[tex] \cos(2 \alpha ) - \sin(2 \alpha ) \times \cot( \alpha ) [/tex]
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Ответ:
решение смотри на фотографии
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Ответ:
1) sin2αcosα−cos2αsinα=sin(2α−α)=sinα2) cos2αcos2α+1=cos2α2cos2α−1+1=2