Q. 153.8( 11 Votes )

# If x = a (cos t +

Answer :

x = a (cos t + t sin t)

Differentiating w.r.t t-

We need to make use of product rule to find derivative of t sin t = a (-sin t +t cos t +sin t) = at cos t ------- (i)

Again differentiating w.r.t t using product rule we get -  = a (Cos t – t Sin t)

y = a (sin t – t cos t)

Differentiating w.r.t t

We need to make use of product rule to find derivative of t cos t. = a (Cos t - t (- Sin t) - Cos t) = a (Cos t + t Sin t – Cos t) = at Sin t ------- (ii)

Again differentiating w.r.t t using product rule we get - Dividing the equation (ii) by equation (i) Differentiating w.r.t x applying chain rule- {using equation i} Rate this question :

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