CUSAT 2022 BTech Solved Paper Shift 1

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Question : 132 of 200

Marks: +1, -0

Given that cos(x−y),cos‌x,cos(x+y) are in HP. Then cos‌x‌sec‌

y

2

is equal to

√2
±√2
‌
1
√2
±‌
1
√2

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