Math; Check my answers please

1. sin(tan^-1(4/3))=4/5

2. find the angle whose tangent equals 0.
tan^-1(cos(pi/2))=0

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asked by Lizzie
  1. both are correct, but I think the answer to #2 does not relate well to the question.

    I'd have said tan^-1(0) = 0 since tan(0) = 0

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    posted by Steve
  2. courtney has a three digit cards.

    they are 6 8 and 3.

    what is the largest number that courtney can write using these digit cards?

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    posted by kareena

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