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因为 -5π/12<=x<=π/6 所以 -5π/6<=2x<=π/3 所以-5π/6- π/6<=2x-π/6<=π/3 -π/6
所以 -π<=2x-π/6<=π/6 所以 sin (-π/2) <=sin(2x-π/6)<=sin(π/6)
所以-1<=sin(2x-π/6)<=1/2 所以 -2<=2sin(2x-π/6)<=1
所以 -π<=2x-π/6<=π/6 所以 sin (-π/2) <=sin(2x-π/6)<=sin(π/6)
所以-1<=sin(2x-π/6)<=1/2 所以 -2<=2sin(2x-π/6)<=1
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