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questions on trigonometric functions

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1. The top of a 30-ft ladder is leaning against the edge of the roof of a house. If the angle of inclination of the ladder from the horizontal is 60 degree, what is the height of the house? How far is the bottom of the ladder from the base of the house?

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Let BC is the ladder, so, BC=30 ft. Given that angle ABC is 600, so ...

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