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kitkat248
@kitkat248
November 2021
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найдите значение выражения cos15градусов(сos 50градусов sin 65градусов -cos65 градусов sin 50 градусов)
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miroshnichenko
Cos15(cos50sin65-cos65sin50)=cos15sin(65-50)=cos15sin15=1/2sin2х15=1/2sin30=1/2х1\2=1\4
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