Let f(x) = sin^(-1) x + cos^(-1) x ". T...

Let `f(x) = sin^(-1) x + cos^(-1) x ". Then " pi/2 ` is equal to

`f(- 1/2)`

`f(k^(2) - 2k + 3), k in R`

`f(1/(1+ k^(2))), k in R`

`f(-2)`

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A, C

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