sin^2a*tana+cos^2a*cota+2sina*cosa求大神帮助sin^2a*tana+cos^2a*cota+2sina*cosa 要化简
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sin^2a*tana+cos^2a*cota+2sina*cosa求大神帮助sin^2a*tana+cos^2a*cota+2sina*cosa要化简sin^2a*tana+cos^2a*cota+
sin^2a*tana+cos^2a*cota+2sina*cosa求大神帮助sin^2a*tana+cos^2a*cota+2sina*cosa 要化简
sin^2a*tana+cos^2a*cota+2sina*cosa求大神帮助
sin^2a*tana+cos^2a*cota+2sina*cosa 要化简
sin^2a*tana+cos^2a*cota+2sina*cosa求大神帮助sin^2a*tana+cos^2a*cota+2sina*cosa 要化简
sin^2a*tana+cos^2a*cota+2sina*cosa =sin^3a/cosa+cos^3a/sina+2sina*cosa =(sin^4a*+cos^4a+2sin^2a*cos^2a )/sinacosa =(sin^2a+cos^2a)^2/sinacosa =1/sinacosa
sin^2a*tana+cos^2a*cota+2sina*cosa =1/(sina*cosa)*[sin^4a+cos^4a+2sin^2a*cos^2a ] =1/(sina*cosa)*(sin^2a+cos^2a)^2 =1/(sina*cosa) sin^2a*tana+cos^2a*cota+2sina*cosa =sin^3a/cosa+cos^3a/sina+2sina*cosa =(sin^4a*+cos^4a+2sin^2a*cos^2a )/sinacosa =(sin^2a+cos^2a)^2/sinacosa =1/sinacosa
证明cos^4 a-sin^4 a=cos^2(1-tana)(1+tana)
证明sin^4 a+cos^4 a=cos^2(1-tana)(1+tana)
tana=2,求sin^2a-cos^2a
tana=2 sin^a+2cos^2a=?
[3sin^2 (a/2)-2sin(a/2)cos(a/2)+cos^2 (a/2)]/[tana+1/tana]
求证sin^2a*tana+cos^2a*1/tana+2sina*cosa=tana+1/tana
化简sin²a*tana+cos²acota+2sinacosa
求证1+2sina cosa/sin^2a-cos^2a=tana+1/tana-1
求证:1+2sina cosa /sin^2a -cos^2a = tana +1/tana -1.
化简:sin^2a*tana+cos^2a/tana+2sina*cosa
(1-2sinAcosA)/(cos^2A-sin^2A)=(1-tanA)/(1+tanA)
证明(1-2sinAcosA)/(cos^2A-sin^2A)=(1-tanA)/(1+tanA)
求证:(1-tana)/(1+tana)=(1-2sinacosa)/(cos^2×a-sin^2×a)
cos^2a-sin^2a/1+2sinacosa=1-tana/1+tana怎么证明?
已知(tana-1)/tana=-1 求1/sin^2a+2sinacosa-cos^2a
tanA=1/ tanA=sinA/ cotA=cosA/ sin^2A+cos^2A=
cos平方A-sin平方A/1+2sinAcosA=1-tanA/1+tanA
求证 sin²a*tana+cos²a*cota+2sina*cosa=tana+cota