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Tuesday, 9 September 2014

U6FM Homework 1 Due Wed 30.9.15

Homework on paper. 27 MARKS

1. Find the values of x for which 2\sinh x + 3\cosh x = 4

[3 marks]

2. Find, simplifying your answer as much as possible!

  1. \int_{0}^{2} \dfrac {2x^3}{1-x^2} dx
  2. \int_{0}^{2} \dfrac {2x}{1-x^2} dx
  3. \int_0^2 \dfrac {2x}{\sqrt {1-x^2}} dx
  4. \int_0^2 \dfrac {2}{\sqrt {1-x^2}} dx

    Note that the last 2 parts have complex (not real) solutions. Bonus points if you can state what they are!! In fact the last one is -\pi(1+2n)-2i\ln{ (2 \pm \sqrt3)}

[12 marks]

3. Find \int \text{sech}^2 x\tanh^7 x dx

[4 marks]

4. Find \dfrac{d}{dx} (\text{sech} x) from the definitions

[4 marks]

5. Find \int_1^2 \dfrac {1}{\sinh x + 2 \cosh x} dx

[4 marks]

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