For \( k \in \mathbb{R} \), let the solutions of the equation
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\cos \left(\sin ^{-1}\left(x \c... VIDEO
For \( k \in \mathbb{R} \), let the solutions of the equationhttps://bit.ly/YTAI_PWAP https://www.pw.live
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\[
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f(x)=\left|\begin{array}{ccc}
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