Ответ: √2cos22° .
Пошаговое объяснение:
sin57° + sin35° = 2sin[( 57° + 35°)/2 ]*cos[( 57° - 35°)/2 ] = 2sin45° *cos22° =
= 2* √2/2 * cos22° = √2cos22° .
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Ответ: √2cos22° .
Пошаговое объяснение:
sin57° + sin35° = 2sin[( 57° + 35°)/2 ]*cos[( 57° - 35°)/2 ] = 2sin45° *cos22° =
= 2* √2/2 * cos22° = √2cos22° .