2sin^-3/5-tan^-17/31
It can be re-written like this:
2×1/(sin^3(x)×5)-1/(tan^17(x)×31)
(2 csc^3(x))/5-(cot^17(x))/31, which is your answer.
If you mean 2sin-1(3/5) - tan-1(17/31) then this is 2*36.87° - 28.74° = 45°
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