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Compare to this post.

Are there any other mistakes that you would expect students to make on this problem?

Thanks to Kristen Fouss for the submission.

 

  • 1 + tan^2 = sec^2, so taking the square root of both sides, 1 + tan = sec.

  • dfrac {tan left( xright) } {1+dfrac {1} {ccos left( xright) }}+dfrac {1+dfrac {1} {ccos left( xright) }}{tan left( xright) }
    then do your “cancel”
    dfrac {sin left( xright) } {1}+dfrac {1} {sin left( xright) }
    and possibly dfrac {sin ^{2}left( xright) +1} {sin(x)}
    and why not dfrac {cos^{2}left( xright) } {sin left( xright) }=dfrac {cosleft( xright) } {tan left( xright) }

    (kids, this is NOT CORRECT)
    My Friday latex workout/ Phew!