sinx=2cosx 求sin^2+1

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sinx=2cosx求sin^2+1sinx=2cosx求sin^2+1sinx=2cosx求sin^2+1sinx=2cosxtanx=2sin^2x+1=sin^2x/(sin^2x+cos^2x

sinx=2cosx 求sin^2+1
sinx=2cosx 求sin^2+1

sinx=2cosx 求sin^2+1
sinx=2cosx
tanx=2
sin^2x+1
=sin^2x/(sin^2x+cos^2x)+1
=tan^2x/(1+tan^2x)+1
=9/5