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