Maths Exam

1. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -4 x -6 y &=& 3 \\ 3 x +2y &=& 3 \end{eqnarray}$$
Correct Answer
$$ x=\frac{12}{5}, y=\frac{-21}{10} $$

2. Differentiation A

Differentiate the following equation: $$\exp\left(\frac{(-x) - 4\sqrt{x}}{4}\right)$$
Correct Answer
$$\frac{\exp\left(\frac{(-x) - 4\sqrt{x}}{4}\right)\left(-1 - \frac{2}{\sqrt{x}}\right)}{4}$$

3. Differentiation A

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

4. Differentiation B

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

5. Integration

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

6. Integration

Please carry out the following integral: $$ \int \sin\left(-5x\right) dx$$
Correct Answer
$$ \frac{\cos\left(-5x\right)}{5} $$

7. Consider the following differential equation: $$ 4\frac{d^2y}{dx^2} + 5\frac{dy}{dx} + y = 0 $$

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

8. Consider the following series: $$ \sum_{j=0}^{17} 4\left(j - 6\right) $$

What does the sum evaluate to?
Correct Answer
$$ 180$$

9. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -6 x -4 y &=& 3 \\ 6 x +6y &=& 2 \end{eqnarray}$$
Correct Answer
$$ x=\frac{-13}{6}, y=\frac{5}{2} $$

10. Differentiation A

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


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