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kristino4kalov
@kristino4kalov
September 2021
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упростите:8cos10*cos20*cos40
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Настюха254
Мы это выражение умножаем и делим на sin10(8sin10cos10cos20cos40)/sin10по формуле 2sinacosa=sin2a(4sin20cos20cos40)/sin10и опять же по этой формуле(2sin40cos40)/sin10
sin80/sin10=sin80/sin(90-80)=sin80/cos80=tg80
1 votes
Thanks 4
kristino4kalov
такого ответа нет,дол;ен быть ctg10
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