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