化简[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]
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化简[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]化简[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]化简[tan(π/4+α)cos2α]/[2cos^2(π/
化简[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]
化简[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]
化简[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]
[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]
=[(tana+1)/(1-tan²a) × (cos²a-sin²a)]/(cosa+sina)²
=[1/(1-tana) × (cosa-sina)] /(cosa+sina)²
=[cosa/(cosa-sina) × (cosa-sina)]/(cosa+sina)²
=cosa×(cosa+sina)²
=cosa × (1+2sinacosa)
=cosa+2sinacos²a
化简cos2α/tan(π/4+α)
cos2α/tan(α+π/4)=
化简cos2(-α)-tan(2π+α)/sin(-α)
tan(π/4+α)=k 求cos2α
化学cos2α/tan(π/4-a)如题
化简[tan(π/4+α)cos2α]/[2cos^2(π/4-α)]
化简cos2(α-π/4)+cos2(α+π/4)
已知tan(π/4+α)=1/2 求(1)tanα的值 (2)sin2α-cos2(平方)α/1+cos2α
化简:sin2α/(1-cos2α)-1/tanα=
化简 2cos2α+sin2αtanα
已知tanα=-3/4,则cos2α=
已知tan(π/4+α)=2,求tanα和sin2α+sinα+cos2α的值
tan(α+π/4)=2,则cos2α+3sin^2α+tan2α=?
2tan(π/4-α)sin2(π/4+α)/2cos2α-1
已知tan(π /4)=1/ 2 求cos2α/sin2α+cos^2α
已知sin2α=a,cos2α=b,求tan(α+π/4)的值.
已知sin2α=a,cos2α=b,求tan(α+π/4)的值
tan(π/4+α)=2010,那么1/cos2α+tan2α=