**Example 1:** Find *f*′( *x*) if *f*( *x*) = cos ^{−1}(5 *x*).

**Example 2:** Find *y*′ if .

**Example 1:** Find *f*′( *x*) if *f*( *x*) = cos ^{−1}(5 *x*).

**Example 2:** Find *y*′ if .

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