sin^2 a*tana+cos^2*cota+2sina*cosa,化简
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sin^2 a*tana+cos^2*cota+2sina*cosa,化简
sin^2 a*tana+cos^2*cota+2sina*cosa,化简
sin^2 a*tana+cos^2*cota+2sina*cosa,化简
sin^2 a*tana+cos^2*cota+2sina*cosa
=sin^2 a*sin a/cosa+cos^2a*cosa/sin a+2sina*cosa
=(sin^4 a+cos^4a)/sina*cosa+2sina*cosa
=(sin^2 a+cos^2a)^2/sina*cosa-2sina*cosa+2sina*cosa
=1/sina*cosa
=2/sin2a
用二倍角,再切化弦,再化简
sin^2 a*tana+cos^2*cota+2sina*cosa,化简
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=
已知tana=2,则sin²a+sinacosa-2cos²a=?