U6FM Hwk

Total: 27 marks. Show all working out. Those not showing mathematical rigour will be penalised.

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1. Express $\cos 6\theta$ in terms of $\cos^n \theta$

   [3 marks]

2. Express $\cos^6 \theta$ in terms of $\cos (n\theta)$

   [4 marks]

3. Solve, giving your answers in the form $re^{i\theta}$ with $-\pi < \theta \leq \pi$ , $$z^6=1-\sqrt3 i$$ Represent your solutions on an Argand diagram

   [4 marks]

4. Represent on an Argand diagram the locus of $z$ s.t.
   1. $\arg{(z-3-2i)} = -\frac{5\pi}{6}$

      [3 marks]

   2. $|z+1|=|z-2i|$ also give the cartesian equation

      [3 marks]

   3. $|z+1|=|4z-8i|$ also give the cartesian equation

      [4 marks]

   4. Give the cartesian equation and sketch the locus $$\arg (\frac{z+3}{z-3}) = 3\pi /4$$

      [6 marks]

L6FM Hwk 3 Due Mon 26.9.16

Total: 26 marks. Show all working out. Those not showing mathematical rigour will be penalised.

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1. Write in the from $a(x+b)^2 + c$
   i.e. complete the square: $$2x^2-5x-3$$

   [3 marks]

2. Simplify $$\frac{2}{x^2-3x-10} - \frac{3}{x^2-25}$$

   [4 marks]

3. Simplify as far as possible: $$\frac{15}{\sqrt {3}} - \frac{11}{2\sqrt{7} + 3\sqrt{3}}$$

   [4 marks]

4. Solve $-3-4x-5x^2>0$ showing how you arrived at your answer.

   [3 marks]

5. $$f(x)=\frac{2\sqrt x-x^2}{3x\sqrt x}$$
   1. Find the equation of the tangent at $x=4$, giving your answer in the form $ax+by+c=0$ where a,b,c are integers

      [5 marks]

   2. Find the equation of the normal at $x=4$, giving your answer in the form $ax+by+c=0$ where a,b,c are integers

      [4 marks]

   3. Find $f''(4)$

      [3 marks]

L6FM Homework 2 Due Mon 19.9.16

Total: 20 marks. Show all working out. Those not showing mathematical rigour will be penalised.

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1. Write in the from $a(x+b)^2 + c$
   i.e. complete the square: $$3x^2-7x-20$$

   [3 marks]

2. Simplify $$\frac{3}{x^2-5x +4} - \frac{5}{x^2-16}$$

   [4 marks]

3. Simplify as far as possible: $$\frac{15}{\sqrt {5}} - \frac{46}{2\sqrt{7} - \sqrt{5}}$$

   [4 marks]

4. Solve $6x^2+x-12>0$

   [3 marks]

5. Solve $5+x+x^2>0$

   [3 marks]

6. Solve $$x^2 = 4+5xy \\ x=5y +1$$

   [3 marks]

L6 FM Homework

Total: 10 marks. Show all working out. Those not showing mathematical rigour will be penalised.

1. Factorise fully $6x^2-7x-20$

   [2 marks]

2. Simplify as far as possible: $$\frac{8}{4^{5x-1}}=\sqrt{32^{3+x}}$$

   [4 marks]

3. Simplify as far as possible: $$\frac{26}{\sqrt {13}} - \frac{8}{\sqrt{13} - \sqrt{11}}$$

   [4 marks]