(1-sin^6α-cos^6α)/(sin^2α-sin^4α)的值
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1-sin^6θ-cos^6θ

= sin^2θ(1-sin^4θ) + cos^2θ(1-cos^4θ)

= sin^2θ[sin^2θ(1-sin^2θ) + cos^2θ] + cos^2θ[cos^2θ(1-cos^2θ)+sin^2θ]

=sin^2θ*cos^2θ*(1+sin^2θ) + sin^2θ*cos^2θ*(1+cos^2θ)

=sin^2θ*cos^2θ*(1+1+sin^2θ+cos^2θ)

=3sin^2θ*cos^2θ

sin^2θ-sin^4θ

=sin^2θ*(1-sin^2θ)

=sin^2θ*cos^2θ

分子/分母 = 3

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