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kuzminanika200
@kuzminanika200
August 2022
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УМОЛЯЮ, ПОМОГИТЕ
Найдите значение выражения [tex] \frac{2}{ \sqrt 13} [/tex]sin a-2 , если cos a = - [tex] \frac{ \sqrt{3} }{4} [/tex]
, a∈[0°,180°]
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amin07am
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2 votes
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sedinalana
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Sina=√(1-cos²a)=√(1-3/16)=√(13/16)=√13/4
2/√13*sina-2=2/√13*√13/4-2=0,5-2=-1,5
2 votes
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Sina=√(1-cos²a)=√(1-3/16)=√(13/16)=√13/42/√13*sina-2=2/√13*√13/4-2=0,5-2=-1,5