a是第四象限角sina+cosa=1/5
a是第四象限角sina+cosa=1/5
求sina*cosa
sina^3+cosa^3
sina-cosa
sina^4-cosa^4
tana
求sina*cosa
sina^3+cosa^3
sina-cosa
sina^4-cosa^4
tana
數(shù)學人氣：880 ℃時間：2020-04-21 19:06:21
優(yōu)質解答
sina+cosa=1/5并且(sina)^2+(cosa)^2=1根據(jù)4象限角~算出sina=-3/5 cosa=4/5所以sina*cosa =-12/25sina^3+cosa^3 =39/125sina-cosa=-7/5sina^4-cosa^4=sina^2-cosa^2=-7/25tana=sina/cosa=-3/4
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