osπ/4cosx-sinπ/4sinx=3/5 cosx-sinx=3√2/5 平方 cosx+sinx-2sinxcosx=18/25 1-2sinxcosx=18/25 sinxcosx=7/50 sinx+cosx=√2sin(x+π/4) 5π/4
若cos(π/4+x)=3/5,17π/12＜x ＜7π/4,求(sin2x+2cosx)/1-tanx的值
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