2010016808
Level:
C
Simplifying the expression \( \cos 2x + \sin 2x \cdot \mathrm{tg}\, x \) for \( x \in \left(0;\frac{\pi}2\right)\) we get:
\( 1 \)
\( \sin^2x \)
\( \cos^2 x \)
\(2 \sin^2 x \)
Sine, cosine, tangent and cotangent
2100004203
Level:
C
Which of the graphs is the graph of the function \(f(x)=|1+\cos x|\)?
9000033810
Level:
C
Find the parity (odd/even) of the function
\(l\colon y = |\mathop{\mathrm{cotg}}\nolimits x|\).
The function \(l\)
is an even function.
The function \(l\)
is an odd function.
The function \(l\)
is neither an odd nor even function.