Maths Exam

1. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -5 x -4 y &=& 4 \\ 5 x +2y &=& 3 \end{eqnarray}$$
Correct Answer
$$ x=2, y=\frac{-7}{2} $$

2. Differentiation A

Differentiate the following equation: $$\sqrt{-5x - \ln\left(x\right)}$$
Correct Answer
$$\frac{-5 - \frac{1}{x}}{2\sqrt{-5x - \ln\left(x\right)}}$$

3. Differentiation A

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

4. Differentiation B

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

5. Integration

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

6. Integration

Please carry out the following integral: $$ \int \cos\left(6x + 1\right) dx$$
Correct Answer
$$ \frac{\sin\left(6x + 1\right)}{6} $$

7. Consider the following differential equation: $$ 3\frac{d^2y}{dx^2} - 6\frac{dy}{dx} + 3y = 0 $$

Find the general solution to the above equation.
Correct Answer
$$ A\exp\left(x\right) + Bx\exp\left(x\right) $$

8. Consider the following series: $$ \sum_{j=0}^{14} 6\left(j + 1\right) $$

What does the sum evaluate to?
Correct Answer
$$ 720$$

9. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -5 x +6y &=& 3 \\ 5 x -5 y &=& 2 \end{eqnarray}$$
Correct Answer
$$ x=\frac{27}{5}, y=5 $$

10. Differentiation A

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


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