mianfeisp

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电影

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=limcosx^2+sinx^2+cosx^2sinx^2-cosx^3/{x^21+cosx(cos2x)^(1/2)}

f(x)+xf(x)=1+2f(x),

cosx = (A-B)sinx + (A+B)cosx

=1/√2ln(√2+1)

=-f(1/x)+(ln1/x)^2/2

f(x)^2=3/(x+C)

=[x(x^2-2x+1)-2]/[2(x-1)]