admin百科知識 2022-02-13 18:40:34 已知(sinα+π2)[1+tan(-α)]=12,則sinαcosα等於已知(sinα π/2)[1 tan(-α)]=1/2,則sinαcosα等於網友廻答：匿名網友(sinα π/2)[1 tan(-α)]=1/2cosα（1-tanα）=1/2cosα（1-sinα/cosα）=1/2cosα-sinα=1/2cos^2α-2sinαcosα sin^2α=1/41-1/4=2sinαcosαsinαcosα=3/8 db標簽 生活常識_百科知識_各類知識大全»已知(sinα+π2)[1+tan(-α)]=12,則sinαcosα等於
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