Maths Exam

1. Solution of linear equations

We have the following equations: $$\begin{eqnarray} -5 x +5y &=& 1 \\ -4 x +3y &=& 2 \end{eqnarray}$$
Correct Answer
$$ x=\frac{-7}{5}, y=\frac{-6}{5} $$

2. Differentiation A

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

3. Differentiation A

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

4. Differentiation B

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

5. Integration

Please carry out the following integral: $$ \int \sqrt{-3x} dx$$
Correct Answer
$$ \frac{-2{\left((-3)x\right)}^{\frac{3}{2}}}{9} $$

6. Integration

Please carry out the following integral: $$ \int \ln\left(x - 1\right) dx$$
Correct Answer
$$ \left(x - 1\right)\ln\left(x - 1\right) - \left(x - 1\right) $$

7. Consider the following differential equation: $$ 2\frac{d^2y}{dx^2} + 3\frac{dy}{dx} - 5y = 0 $$

Find the general solution to the above equation.
Correct Answer
$$ A\exp\left(x\right) + B\exp\left(\frac{-5x}{2}\right) $$

8. Consider the following series: $$ \sum_{j=0}^{10} 5\left(j + 1\right) $$

What does the sum evaluate to?
Correct Answer
$$ 330$$

9. Solution of linear equations

We have the following equations: $$\begin{eqnarray} x +4y &=& 3 \\ x -4 y &=& 2 \end{eqnarray}$$
Correct Answer
$$ x=\frac{5}{2}, y=\frac{1}{8} $$

10. Differentiation A

Differentiate the following equation: $$\cos\left(\sqrt{2x}\right)$$
Correct Answer
$$\frac{-2\sin\left(\sqrt{2x}\right)}{2.8284271247461903\sqrt{x}}$$


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