Find the indefinite integral by making the substitution x = 9sece. √ √x²-81 X dx Select one: O a. √√²-81 OC. O d. 9 √ ² 7 ) + c - X x2-81-9arcsec O b. √√²-81 +9arcsec (5) 9 (²/²) + C - X √√²-81 +9arcsec +C X csec ) + C √√x²-81-9arcsec √√x²-81-81 arcsec x {(\/\)] + c C

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