Multiple Choice Question: Let $f(x)=\sin x - \cos x$. Find the 2021st derivative of $f$.

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

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Compute the cost of lumber necessary to resurface a foot-bridge 16 feet wide and 150 feet long with 2-inches planks, if lumber is P48.00 per board foot.
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