y=-2sin(2x-π/6)+2cos(2x-π/6)
=-2√2[√2/2*sin(2x-π/6)-√2/2*cos(2x-π/6)]
=-2√2[sin(2x-π/6)cosπ/4-cos(2x-π/6)sinπ/4]
=-2√2[sin(2x-π/6-π/4)]
=-2√2*sin(2x-5π/12)
y=-2sin(2x-π/6)+2cos(2x-π/6)化成Asin（wx+Q）正弦型函数
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