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2 marksIntegration II

CAPE Pure Mathematics Unit 2 · May/June 2015 · Paper 2 · Question 2(b)(i)

The rational function f(x) = \frac{18x^2 + 13}{9x^2 + 4} is defined on the domain -2 \le x \le 2.

Express f(x) in the form a + \frac{b}{9x^2 + 4} where a, b \in \mathbb{R}.

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Other parts of this question

  1. 2(a)(i)Use implicit differentiation to show that \frac{dy}{dx} = -\frac{8x + 3y^2 + 7}{3(1 + 2xy)}.[5 marks]
  2. 2(a)(ii)Show that for f(x, y) = 4x^2 + 3xy^2 + 7x + 3y,…[5 marks]
  3. 2(b)(ii)Given that f(x) is symmetric about the y-axis, evaluate \int_{-2}^2 f(x)\,dx.[6 marks]
  4. 2(c)(i)Show that \int h^n \ln h\,dh = \frac{h^{n+1}}{(n+1)^2} [-1 + (n+1)\ln h] + C, where -1 \ne n \in \mathbb{Z} and C \in \mathbb{R}.[5 marks]
  5. 2(c)(ii)Hence, find \int \sin^2 x \cos x \ln(\sin x)\,dx.[2 marks]

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