# The angle of elevation of the sun is decreasing by 1/4 radians per hour. How fast is the shadow cast by a building of height 50 meters lengthening, when the angle of elevation of the sun is #pi/4#?

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The shadow cast by the building is lengthening at a rate of ( \frac{25}{2} ) meters per hour.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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