B

2010015101

Level: 
B
Let by \(X\) and \(Y\) denote the intersection points of the graph of the function \(f(x)=\frac{2}{x+3}-1\) with \(x\) and \(y\)-axis, respectively. Find coordinates of \(X\) and \(Y\).
\(X = [-1;0]\), \(Y = \left[0;-\frac13\right]\)
\(X = [1;0]\), \(Y = \left[0;\frac13\right]\)
\(X = \left[-\frac13;0\right]\), \(Y = [0;-1]\)
\(X = [-3;0]\), \(Y = [0;-1]\)

2010015008

Level: 
B
Consider a regular polygon with the central angle of \(15^{\circ}\). In the figure the cut of a regular polygon with unspecified number of vertices is shown. The red angle is the central angle of the polygon. Find the number of vertices of this polygon.
\(24\)
\( 12 \)
\( 20 \)
\( 18 \)

2010015006

Level: 
B
The figure shows a rectangular trapezium whose bases have lengths of \( 19\,\mathrm{cm} \) and \( 14\,\mathrm{cm} \), and the longer arm is \( 13\,\mathrm{cm} \) long. Calculate the sine of angle \(\alpha\).
\( \frac{12}{13} \)
\( \frac{5}{13} \)
\( 22.62^{\circ} \)
\( 67.38^{\circ} \)

2010015005

Level: 
B
Given the isosceles trapezium \( ABCD \), where \( |AB| = 12\,\mathrm{cm} \), \( |BC| = 4\,\mathrm{cm} \), \( |CD| = 16\,\mathrm{cm} \), and \( |AD| = 4\,\mathrm{cm} \), determine the measure of \( \measuredangle BCD \).
\( 60^{\circ} \)
\( 70^{\circ} \)
\( 45^{\circ} \)
\( 120^{\circ} \)

2010014905

Level: 
B
Identify the optimal first step convenient to solve the following trigonometric equation. Do not consider the step which is possible but does not help to solve the equation. \[ \mathop{\mathrm{tg}}^2\nolimits x - 2\mathop{\mathrm{tg}}\nolimits x -3=0 \]
substitution \( \mathop{\mathrm{tg}}\nolimits x =y\)
\(\mathop{\mathrm{tg}}\nolimits x (\mathop{\mathrm{tg}}\nolimits x -2)=3\)
\(\frac{\sin^2 x}{\cos^2 x}-2\frac{\sin x}{\cos x}-3=0\)
\(\mathop{\mathrm{tg}}\nolimits x-2=3-\mathop{\mathrm{tg}}\nolimits x \)