Ответ:
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5cos 78⁰ 5cos(90°-12°)
_________= _____________=
cos6⁰ cos84⁰ cos(6°)cos(84°)
5sin(12°) 5×2sin(90°-84°)
=_________ =______________
cos (6°)cos(84°) cos(6°)cos(84°)
5×2cos(84°)
=____________= 5×2=10
cos(84°)
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Ответ:
________________________________________________________________________________________________
Ответ:
5cos 78⁰ 5cos(90°-12°)
_________= _____________=
cos6⁰ cos84⁰ cos(6°)cos(84°)
5sin(12°) 5×2sin(90°-84°)
=_________ =______________
cos (6°)cos(84°) cos(6°)cos(84°)
5×2cos(84°)
=____________= 5×2=10
cos(84°)