求解,最好是纸上写出来。谢谢
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原式=lim(x->0) √2*[1-√(1/2+cosx/2)]/(x^2/2)
=lim(x->0) √2*[1-√(1+cosx/2-1/2)/(x^2/2)
=lim(x->0) √2*[-(cosx/2-1/2)/2]/(x^2/2)
=lim(x->0) (√2/2)*(1-cosx)/(x^2)
=lim(x->0) (√2/2)*(x^2/2)/(x^2)
=√2/4
=lim(x->0) √2*[1-√(1+cosx/2-1/2)/(x^2/2)
=lim(x->0) √2*[-(cosx/2-1/2)/2]/(x^2/2)
=lim(x->0) (√2/2)*(1-cosx)/(x^2)
=lim(x->0) (√2/2)*(x^2/2)/(x^2)
=√2/4
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