Maths Exam

1. Solution of linear equations

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

2. Differentiation A

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

3. Differentiation A

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

4. Differentiation B

Differentiate the following equation: $$\frac{-1 - x + \sin\left(x\right)}{\ln\left(x - 4\right)}$$
Correct Answer
$$\frac{\cos\left(x\right) - 1}{\ln\left(x - 4\right)} - \frac{-1 - x + \sin\left(x\right)}{{\ln\left(x - 4\right)}^{2}\left(x - 4\right)}$$

5. Integration

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

6. Integration

Please carry out the following integral: $$ \int {\left((-3)x\right)}^{-5} dx$$
Correct Answer
$$ \frac{1}{972{x}^{4}} $$

7. Consider the following differential equation: $$ 6\frac{d^2y}{dx^2} + \frac{dy}{dx} - 2y = 0 $$

Find the general solution to the above equation.
Correct Answer
$$ A\exp\left(\frac{x}{2}\right) + B\exp\left(\frac{-2x}{3}\right) $$

8. Consider the following series: $$ \sum_{j=0}^{12} (-\left(j + 2\right)) $$

What does the sum evaluate to?
Correct Answer
$$ -104$$

9. Solution of linear equations

We have the following equations: $$\begin{eqnarray} 3 x -3 y &=& 4 \\ 4 x -5 y &=& 4 \end{eqnarray}$$
Correct Answer
$$ x=\frac{8}{3}, y=\frac{4}{3} $$

10. Differentiation A

Differentiate the following equation: $$-4{x}^{5} + \ln\left(-1 - x\right)$$
Correct Answer
$$-20{x}^{4} + \frac{-1}{-1 - x}$$


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