Find the interval containing x = 0 where f(x) = 81x - tan(x) is increasing. Write your answer as an open interval in the form (a,b). Give exact values, not a decimal approximations, for the endpoints. To express the inverse cosine function cos ¹(x), type arccos(x). Interval:

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A: As per our guidelines we can answer only 1 question so kindly repost the remaining questions…

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A: Note: As per our guidelines, we can solve first three sub parts as your all parts are not small.

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