①已知sinαcosα=1/8,45°

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①已知sinαcosα=1/8,45°①已知sinαcosα=1/8,45°①已知sinαcosα=1/8,45°1B(cosα-sinα)^2=cos^2α-2sinαcosα+sin^2α=1-2

①已知sinαcosα=1/8,45°
①已知sinαcosα=1/8,45°

①已知sinαcosα=1/8,45°
1B
(cosα-sinα)^2=cos^2α-2sinαcosα+sin^2α
=1-2sinαcosα
=3/4
45°

1B
2B