Posted by **hasee** on Thursday, April 4, 2013 at 1:53am.

cot^-1(2tan(cos^-18/17))+tan^-1(2tan(sin^-18/17))=tan^-1300/161

- math -
**Reiny**, Thursday, April 4, 2013 at 8:12am
the cos^-18/17 and the sin^-18/17 in your expression don't make sense

did you mean cos^-1 (18/17) ?

in that case, that would be undefined, since no angle exists such that cosØ = 18/17

same thing would be true for the sine part

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