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Improved version of the Rivlin's theorem has been stated and proved.Mathematics subject classification (1991): 30C10, 30C15.

An experiment was conducted to study the effect of different concentrations of gibberellic acid, spacing and nutrient sprays on vegetative and floral parameters of snapdragon (Antirrhinum majus cv. Rocket Pink) at Urban Technological Park, Habak, Srinagar, J&K, India during two successive years in 2017and 2018. Eighteen different treatments with 3 concentrations of gibberellic acid (0 ppm, 100 ppm and 200 ppm), 2 spacings (15 cm x 15 cm and 15 cm x 20 cm) and nutrient sprays (3 sprays, 4 sprays and 5 sprays) were replicated thrice in Completely Randomized Block Design. Original Research Article

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In this paper we improve a result recently proved by Irshad et al. [On the Inequalities Concerning to the Polar Derivative of a Polynomial with Restricted Zeroes, Thai Journal of Mathematics, 2014 (Article in Press)] and also extend Zygmund's inequality to the polar derivative of a polynomial.