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July 2022
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Вычислите cos70+sin140-cos10
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Evelyn7
Verified answer
Cos70+sin140-cos10=(cos70-cos10)+ sin140=
=-2sin40sin30+sin(180-40)=-2sin40sin30+sin40=sin40(-2sin30+1)=
=sin40(-2*1/2+1)=0
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Answers & Comments
Verified answer
Cos70+sin140-cos10=(cos70-cos10)+ sin140==-2sin40sin30+sin(180-40)=-2sin40sin30+sin40=sin40(-2sin30+1)=
=sin40(-2*1/2+1)=0