Maths Exam

1. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -6 x -4 y &=& 1 \\ 4 x +3y &=& 2 \end{eqnarray}$$
Correct Answer
$$ x=\frac{-11}{2}, y=8 $$

2. Differentiation A

Differentiate the following equation: $$\frac{2\exp\left(2x\right)}{\sqrt{x}}$$
Correct Answer
$$\frac{4\exp\left(2x\right)}{\sqrt{x}} - \frac{\exp\left(2x\right)}{{x}^{1.5}}$$

3. Differentiation A

Differentiate the following equation: $$\exp\left(\sin\left({x}^{2}\right)\right)$$
Correct Answer
$$2\exp\left(\sin\left({x}^{2}\right)\right)\cos\left({x}^{2}\right)x$$

4. Differentiation B

Differentiate the following equation: $$\frac{\left(x - 5\right)\cos\left(x\right)}{\ln\left(x - 4\right)}$$
Correct Answer
$$\frac{\cos\left(x\right) - \left(x - 5\right)\sin\left(x\right)}{\ln\left(x - 4\right)} - \frac{\left(x - 5\right)\cos\left(x\right)}{{\ln\left(x - 4\right)}^{2}\left(x - 4\right)}$$

5. Integration

Please carry out the following integral: $$ \int {\left(6x - 3\right)}^{-6} dx$$
Correct Answer
$$ \frac{-1}{30{\left(6x - 3\right)}^{5}} $$

6. Integration

Please carry out the following integral: $$ \int \cos\left(6x - 4\right) dx$$
Correct Answer
$$ \frac{\sin\left(6x - 4\right)}{6} $$

7. Consider the following differential equation: $$ 4\frac{d^2y}{dx^2} - 3\frac{dy}{dx} - y = 0 $$

Find the general solution to the above equation.
Correct Answer
$$ A\exp\left(x\right) + B\exp\left(\frac{(-x)}{4}\right) $$

8. Consider the following series: $$ \sum_{j=0}^{16} -3\left(j + 5\right) $$

What does the sum evaluate to?
Correct Answer
$$ -663$$

9. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -2 x +y &=& 1 \\ -5 x +4y &=& 4 \end{eqnarray}$$
Correct Answer
$$ x=0, y=1 $$

10. Differentiation A

Differentiate the following equation: $$\exp\left(\sqrt{\cos\left(x\right)}\right)$$
Correct Answer
$$\frac{(-\exp\left(\sqrt{\cos\left(x\right)}\right)\sin\left(x\right))}{2\sqrt{\cos\left(x\right)}}$$


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