# At the foot of a mountain the angles of elevation of its summit is 45 degree, after ascending 1 km forwards at an inclination of 30 degree, the elevation changes to 60 degree ,what is the height of the mountain?

The height of the mountain is

Let AB be the height of the mountain and above be the figure as described in the question.

In rt

In rt

In rt

Now, the height of the mountain

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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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