\(\int {\frac{1}{{\sqrt {1 - {x^2}} }}} dx = \_\_\_\_\_:\)

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13 + 1 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

\(\int {\frac{1}{{\sqrt {1 - {x^2}} }}} dx = \_\_\_\_\_:\)

-cos-1x

cos-1x

-sin-1x

sin-1x