BITSAT 2005 Solved Question Paper

Section: Mathematics

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Question : 43 of 150

Marks: +1, -0

If r=[2ϕ+cos2(2ϕ+

π

4

)]

1

2

, then what is the value of the derivative of

dr

dϕ

at ϕ=

π

4

?

2(
1
π+1
)
1
2
2(
2
π+1
)2
(
2
π+1
)
1
2
2(
2
π+1
)
1
2

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