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Question

If x=a(t+sint), y=a(1−cost) if dxdy=cotp then p=

A
t
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B
2t
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C
t2
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D
t2
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Solution

The correct option is C t2
x=a(t+sint)
y=a(1cost)
dxdt=a[1+cost]
dydt=a(0+sint)
dxdy=cotp then p=?
dxdy=a[1+cost]asint
=[1+2cos2t/212sint/2cos]
=2cos2t/22sint/2cost/2
dxdy=cott/2

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