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Deniwka
@Deniwka
November 2021
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нужно срочно плиз, заранее спасибо! <3
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skyne8
Verified answer
1)sin2a=2sinacosa=2sina√(1-(sina)^2)=
2(15/17)√(17^2 -15^2)/17=2(15/17)8/17=
240/289
2)=-2sin((55+35)/2)sin((55-35)/2)/
2sin((55+35)/2)cos((55-35)/2)=
-sin10/cos10=-tg10°
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Answers & Comments
Verified answer
1)sin2a=2sinacosa=2sina√(1-(sina)^2)=2(15/17)√(17^2 -15^2)/17=2(15/17)8/17=
240/289
2)=-2sin((55+35)/2)sin((55-35)/2)/
2sin((55+35)/2)cos((55-35)/2)=
-sin10/cos10=-tg10°