Check my math.

Check my math.

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1. \[\cos (\cos^{-1} \frac{ 1 }{ 2 })=\frac{ 1 }{ 2 }\]

cos and cos-1 are inverses of each other. inverses cancel out. so yes 1 is correct

2.\[\cos (\cos^{-1} 2)=2 \]

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