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展开全部
解:1、原式=6根号5((根号3/2)sinx+(1/2)cosx)=6根号5(sinxcosπ/6+cosxsinπ/6)=6根号5sin(x+π/6)
2、2(根号3/2sin(x/2)+1/2cos(x/2))=2sin(x/2+π/6)
3、原式=sin(360-13)cos(180-32)+sin(90-13)cos(90-32)
=(-sin13)(-cos32)+cos13sin32
=sin13cos32+cos13sin32
=sin(13+32)=sin45=根号2/2
2、2(根号3/2sin(x/2)+1/2cos(x/2))=2sin(x/2+π/6)
3、原式=sin(360-13)cos(180-32)+sin(90-13)cos(90-32)
=(-sin13)(-cos32)+cos13sin32
=sin13cos32+cos13sin32
=sin(13+32)=sin45=根号2/2
展开全部
1、原式=6√5((√3/2)sinx+(1/2)cosx)=6√5(sinx cos π/6+cosx sinπ/6)=6√5sin(x+π/6)
3、原式=2(√3/2sin(x/2)+1/2cos(x/2))
=2(sinx cos π/6+cosx sinπ/6)
=2sin(x/2+π/6)
5、原式=sin(360°-13°)cos(180°-32°)+sin(90°-13°)cos(90°-32°)
=(-sin13°)(-cos32°)+cos13°sin32°
=sin13°cos32°+cos13°sin32°
=sin(13°+32°)=sin45°=√2/2
3、原式=2(√3/2sin(x/2)+1/2cos(x/2))
=2(sinx cos π/6+cosx sinπ/6)
=2sin(x/2+π/6)
5、原式=sin(360°-13°)cos(180°-32°)+sin(90°-13°)cos(90°-32°)
=(-sin13°)(-cos32°)+cos13°sin32°
=sin13°cos32°+cos13°sin32°
=sin(13°+32°)=sin45°=√2/2
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