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Derivatives of inverse trigonometric functions

AP.CALC: FUN‑3 (EU), FUN‑3.E (LO), FUN‑3.E.2 (EK)
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h, left parenthesis, x, right parenthesis, equals, \arctan, left parenthesis, minus, start fraction, x, divided by, 2, end fraction, right parenthesis
h, prime, left parenthesis, minus, 7, right parenthesis, equals
Use an exact expression.