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trig pre calc

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cos x (sec x +cos x csc2x)=csc2x

  • trig pre calc - ,

    cosx secx=1
    cos^2 *csc^2= ctn^2 x
    1+ctn^2=csc^2
    multipy left by sin^2/sin^2
    1/sin^2 (sin^2+cos^2)=
    csc^2 = csc^2

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