\[ \int{ \color{Goldenrod}\sin}\ {z} = - {\color{Blue}\cos}\ {z} \]

\[ \int{\color{Blue} \cos}\ {z} ={\color{Goldenrod} \sin}\ {z} \]

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The problem presented here is:

**A baseball diamond is a square with side 90 feet. If a batter hits the ball and runs towards first base with a speed of 20 ft. per sec, at what speed is his distance from second base decreasing when he is halfway to first base?**