Level:
Project ID:
1003085808
Accepted:
1
Clonable:
0
Easy:
0
Which of the following inequalities has no solutions for \( x\in\mathbb{R} \)?
\( \cos^2x -\sin^2x > 1 \)
\( 100\sin x > 1 \)
\( \sin x \cdot \cos x \geq \frac12 \)
\( |\sin x| \geq 1 \)