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Let △ABC be an isosceles triangle such that AB and AC are of equal length. AD is the altitude from A on BC and BE is the altitude from B on AC. If AD and BE intersect at O such that ∠AOB=105°, then AD/BE equals:

CAT · 2023 · Quant Slot 3
Question:
Let △ABC be an isosceles triangle such that AB and AC are of equal length. AD is the altitude from A on BC and BE is the altitude from B on AC. If AD and BE intersect at O such that ∠AOB=105°, then AD/BE equals:

Options

(2sin15°
cos15°
2cos15°
sin15°
Answer: 2cos15°

Explanation:
In isosceles triangle with AB = AC, using properties of altitudes and the given angle, we can establish that AD/BE = 2cos15° through trigonometric relationships involving the orthocenter.

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