三角函数,化简,

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三角函数,化简,
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三角函数,化简,
三角函数,化简,
 

三角函数,化简,
f(x)=4cosxsin(x+π/6)-1
=4cosx(√3/2sinx+1/2cosx)-1
=2√3sinxcosx+2cosxcosx-1
=√3sin2x+cos2x
=2sin(2x+π/6)

f(x)=4cosx(sinx·√3/2+cosx·1/2)-1
=2√3sinxcosx+2cos^2x-1
=√3sin2x+cos2x-1
=2sin(2x+π/6)-1