BITSAT 2017 Slot 2 Solved Paper

Section: Mathematics

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Question : 113 of 150

Marks: +1, -0

If cos(x−y),cos‌x and cos(x+y) are in HP, thencos‌x‌sec(y∕2) is equal to

±√2
±1∕√2
±2
None of these

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