化简:sin^2a*tana+cos^2a/tana+2sina*cosa
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化简:sin^2a*tana+cos^2a/tana+2sina*cosa
![化简:sin^2a*tana+cos^2a/tana+2sina*cosa](/uploads/image/z/13754917-37-7.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9Asin%5E2a%2Atana%2Bcos%5E2a%2Ftana%2B2sina%2Acosa)
sin^2a*tana+cos^2a/tana+2sina*cosa
=(1-cos^2a)*tana+(1-sin^2a)/tana+2sina*cosa
=tana-sina*cosa+1/tana-sina*cosa+2sina*cosa
=tana+1/tana
=(1-cos^2a)*tana+(1-sin^2a)/tana+2sina*cosa
=tana-sina*cosa+1/tana-sina*cosa+2sina*cosa
=tana+1/tana
化简:sin^2a*tana+cos^2a/tana+2sina*cosa
求证sin^2a*tana+cos^2a*1/tana+2sina*cosa=tana+1/tana
tanA=1/ tanA=sinA/ cotA=cosA/ sin^2A+cos^2A=
1 化简 sina.cosa.(tana+1/tana) 2 sin(-a).cos(2π+a).tan(-a-π) 大
sin^2 a*tana+cos^2*cota+2sina*cosa,化简
已知tana=3,求①sina+cosa/2sina-cosa ②sin²a+sina·cosa+3cos
已知tana=2,则sin^2a+sina*cosa-2cos^2a=
已知tana=3 求2sin(a)^2 +sina*cosa-3cos(a)^2值
sin^2a乘以tana+cos^2a乘以cota+2sina乘以cosa-cota
sin^2a*tana+cos^2a*cota+2sina*cosa化简一下
设tana=2,计算sin(π-a)+cosa/sina-cos(2π-a)
解方程sin^2a+cos^2a=1 sina/cosa=tana