COMEDK Exam 2017 Solved Paper

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Question : 129 of 180
 
Marks: +1, -0
The value of cos(‌
Ï€
4
−x
)
‌cos
(‌
Ï€
4
−y
)
−sin‌(‌
Ï€
4
−x
)
s
i
n
‌(‌
Ï€
4
−y
)
is equal to
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