Q. 165.0( 1 Vote )

# If x = a (1 + cos

Answer :

Idea of parametric form of differentiation:

If y = f (θ) and x = g(θ) i.e. y is a function of θ and x is also some other function of θ.

Then dy/dθ = f’(θ) and dx/dθ = g’(θ)

We can write : Given,

y = a (θ + sin θ) ……equation 1

x = a (1+ cos θ) ……equation 2

to prove : .

We notice a second-order derivative in the expression to be proved so first take the step to find the second order derivative.

Let’s find As, So, lets first find dy/dx using parametric form and differentiate it again. …..equation 3

Similarly, ……equation 4

[  …..equation 5

Differentiating again w.r.t x : Using product rule and chain rule of differentiation together:  [using equation 4] As we have to find put θ = π/2 in above equation: =  Rate this question :

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