In Exercises 21-42, find the derivative of y with respect to the appro-priate variable. 21. $y = \cos^{-1}(x^2)$ 23. $y = \sin^{-1}\sqrt{2t}$ 25. $y = \sec^{-1}(2s + 1)$ 27. $y = \csc^{-1}(x^2 + 1)$, $x > 0$ 29. $y = \sec^{-1}\frac{1}{t}$, $0 < t < 1$ 31. $y = \cot^{-1}\sqrt{t}$ 33. $y = \ln(\tan^{-1}x)$ 22. $y = \cos^{-1}(\frac{1}{x})$ 24. $y = \sin^{-1}(1 - t)$ 26. $y = \sec^{-1}5s$ 28. $y = \csc^{-1}\frac{x}{2}$ 30. $y = \sin^{-1}\frac{3}{t^2}$ 32. $y = \cot^{-1}\sqrt{t - 1}$ 34. $y = \tan^{-1}(\ln x)$
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