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Give the name and chemical formulae of all preservatives used in the kitchen .? Give the pH value of at least 10 eatables .Identify base and acid among these.? 10 feet 30 inches into inches? How to differentiate: x^y + y^x = c?? Please help urgently..? Differentiate: i) sqrt (sinx)/ sin sqrt(x) ii) sin^3 x iii) tan (sinx) iv) arctan (x sin α) / (1 +xcos α)?