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alekseicat
@alekseicat
July 2022
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18
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номер 10!!срочно пожалуйста!!
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sedinalana
Verified answer
2sin80cos60*2cos60cos10+(sin50-sin70)(cos40-cos20)=
=4*1/2*1/2*cos10*cos10+2*(-sin10)cos60*(-2sin30sin10)=
=cos²10+4*1/2*1/2*sin²10=cos²10+sin²10=1
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alekseicat
пожалуйста подробнее
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Verified answer
2sin80cos60*2cos60cos10+(sin50-sin70)(cos40-cos20)==4*1/2*1/2*cos10*cos10+2*(-sin10)cos60*(-2sin30sin10)=
=cos²10+4*1/2*1/2*sin²10=cos²10+sin²10=1