2cos(2x+π/3)怎么变成sin

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2cos(2x+π/3)怎么变成sin2cos(2x+π/3)怎么变成sin2cos(2x+π/3)怎么变成sin2cos(2x+π/3)=2sin[π/2-(2x+π/3)]=2sin(-2x+π/

2cos(2x+π/3)怎么变成sin
2cos(2x+π/3)怎么变成sin

2cos(2x+π/3)怎么变成sin
2cos(2x+π/3)
=2sin[π/2-(2x+π/3)]
=2sin(-2x+π/6)
=-2sin(2x-π/6)