根号sin^α-sin^4α（π/2〈α〈π）化简
问题描述：
根号sin^α-sin^4α（π/2〈α〈π）化简
根号sin平方α-sin4次方α（π/2〈α〈π）化简··········
答
这个sin^2α-sin^4α?
sin^2α-sin^4α
=sin²α(1-sin²α)
=sin²αcos²α
=1/4(2sinαcosα)²
=1/4sin²2α