若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ
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若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ若sin(a+β)=1/5,sin(a-β)=3/5
若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ
若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ
若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ
sin(a+β)= sina cosβ +cosa sinβ = 1/5
sin(a-β)= sina cosβ -cosa sinβ = 3/5
解得
sina cosβ = 2/5
cosa sinβ = -1/5
做商
tana /tanβ= sina cosβ /cosa sinβ = -2
1-sin a+sin a的平方-sin a的立方+……若a是正锐角,且sin a-cos a=0.5,求1-sin a+sin^2a-sin^3a+……
若sin(a+β)=3/5,sin(a-β)=1/5,则tana/tanβ=
若sin(a+β)=1/5,sin(a-β)=3/5,则tana/tanβ
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