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Дианчик2000
@Дианчик2000
September 2021
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решите пожалуйста,срочно нужно
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sedinalana
Verified answer
1)ctgb-tga
2))cosacosb-sinasinb+sinasinb)/(sinacosb+cosasinb-cosasinb)=
=cosacosb/(sinacosb)=cosa/sinb=ctga
3)cos²Ф+cos2Ф=cos²Ф+2cos²Ф-1=3cos²Ф-1
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Answers & Comments
Verified answer
1)ctgb-tga2))cosacosb-sinasinb+sinasinb)/(sinacosb+cosasinb-cosasinb)=
=cosacosb/(sinacosb)=cosa/sinb=ctga
3)cos²Ф+cos2Ф=cos²Ф+2cos²Ф-1=3cos²Ф-1