Let A be a point in space such that | OA |=12, where O is the origin. If OA is inclined at angles 45^ and 60^ with x-axis and y-axis respectively, then what is OA equal to?

NDA 2020 Mathematics question

Let A be a point in space such that , where O is the origin. If is inclined at angles and with x-axis and y-axis respectively, then what is equal to?

Answer: (C)

, , and $ = 1-12-14 =

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Question ID VK-029238