1. An Engineer is facing his new build house. Standing 12 ft. from the house, the eye level of the engineer is 6 ft. above the ground. If the house is 20 ft. tall and its base is 8 ft. above the ground, find the viewing angle from the house to the eye level of the engineer. Use tangent Sum Identity.

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A: The rules of inference is written in respective lines that has been used in the proof.

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A: Using rules of inference the proof is given below. Rules are written in respective rows.

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A: