sin2t/16
=sintcost/8
=u/8(1+u^2)
=x^4/8(1+x^8)
其中,sintcost=sintcosx/(sin^2t+cos^2t)=tant/(tan^2t+1)=u/(u^2+1)
sin2t/16
=sintcost/8
=u/8(1+u^2)
=x^4/8(1+x^8)
其中,sintcost=sintcosx/(sin^2t+cos^2t)=tant/(tan^2t+1)=u/(u^2+1)
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