The number of elements in the set
\[
S=\left\{x \in \mathbb{R}: 2 \cos \left(\frac{x^{2}+x}{6}\r... VIDEO
The number of elements in the sethttps://bit.ly/YTAI_PWAP https://www.pw.live
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\[
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\[
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\[
\begin{... 2023-06-19 Solve the system of equations,
\[
\begin{array}{l}
\sin x \sin y=\sqrt{3} / 4 \\
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\[
\cos ^{2}\left[\frac{\pi}{4}\left(\sin x+\sqrt{2} \cos ^{2} x\right)\right...
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