I have the following problem :

If $\sec(1.4) = x$, find the value of $\csc(2\tan^{-1}x)$.

(A) $0.33$

(B) $0.87$

(C) $1.00$

(D) $1.06$

(E) $3.03$

I we take the $1.4$ as degrees, we get option (C), if we take it as radians, we get (E). Besides common sense, what other ways do we have to conclude that it the $1.4$ is in radians?

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$\tan^{-1}(x)$ or $\tan^{-1}(1.4)$? – Babak S. May 3 '13 at 9:25
It is tan−1(x). – Hele May 3 '13 at 9:26
I'm sorry, i think you dont understand my question. I know how to solve the sum. Please read the question thoroughly. – Hele May 3 '13 at 9:32
While I agree this question isn't very well written, I'd think that if these were degrees they would have the little circle next to them. – Javier May 3 '13 at 9:49