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Question

The length of normal to the curve x = a(θ+sin θ) at the point θ=π/2 is
[RPET 1999]

A
2a
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B
a/2
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C
2a
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D
a/2
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Solution

The correct option is A 2a
Let y = xn+1; then y1=(n+1)xn
y2=n(n+1)xn1
y3=n(n+1)(n1)xn2
..................................
..................................
yn=(n+1)!x.

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