π/6≤sin(2x-π/6)≤5π/6化简

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π/6≤sin(2x-π/6)≤5π/6化简
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π/6≤sin(2x-π/6)≤5π/6化简
π/6≤sin(2x-π/6)≤5π/6
化简

π/6≤sin(2x-π/6)≤5π/6化简
因为
x∈(π/6,5π/12)
所以
2x+π/6∈(π/2,π)
得到
cos(2x+π/6)=-3/5
因此
cos(2x-π/12)= cos(2x+π/6-π/4)= cos(2x+π/6)cosπ/4 + sin(2x+π/6)sinπ/4
= √2/2*(-3/5+4/5)= √2/10
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