If x = a(cos θ + θ sin θ ) and Differentiating with respect to θ ⇒ ⇒ ⇒ Differentiating with respect to x ⇒ ⇒ ⇒ Hence Proved
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If x = a(cos θ + θ sin θ ) and Differentiating with respect to θ ⇒ ⇒ ⇒ Differentiating with respect to x ⇒ ⇒ ⇒ Hence Proved ⇒