设M=∫(-π/4,π/4)1/√(1-x^2)[1/(1+e^x)-1/2]dx,N=∫(-π/4,π/4){[2^x-2^(-x)]/2+xtanx}dx,
P=∫(-π/4,π/4){(sinx)^2*ln[x+√(1+x^2)]-1}dx,则有不等式关系()
AN
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