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Vladislav06supe
@Vladislav06supe
August 2022
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Срочно ! Пожалуйста помогите решить
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sedinalana
Verified answer
1
а)sin1,5acos1,5a=0,5sin3a (sin2x=2sinxcosx)
б)2cos²4a-1=cos8a (cos2x=2cos²x-1)
в)1-cos12a=2sin²6a (cos2x=1-2sin²x)
2
sin²3x=(1-cos6x)/2 (cos2x=1-2sin²x)
3
а)cos²15-sin²15=cos30=√3/2 (в примере опечатка)
б)2-4sin²π/12=2(1-2sin²π/12)=2*cosπ/6=2*√3/2=√3
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wangross
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Answers & Comments
Verified answer
1а)sin1,5acos1,5a=0,5sin3a (sin2x=2sinxcosx)
б)2cos²4a-1=cos8a (cos2x=2cos²x-1)
в)1-cos12a=2sin²6a (cos2x=1-2sin²x)
2
sin²3x=(1-cos6x)/2 (cos2x=1-2sin²x)
3
а)cos²15-sin²15=cos30=√3/2 (в примере опечатка)
б)2-4sin²π/12=2(1-2sin²π/12)=2*cosπ/6=2*√3/2=√3