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Question

If y=(1+cos 2 θ1cos2 θ),dydθ at θ=3π4 is

A
2
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B
2
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C
±2
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D
None of these
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Solution

The correct option is B 2
y=(1+cos 2 θ1cos 2 θ)
=|cotθ|=cot θ(θ=3π4)
dydθ=cosec2θ
dydθ|θ=3π/4=(2)2=2

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