- 2tan^2xcosx-tan^2 x =0?

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If 25 people are randomly selected, what is the probability that their mean IQ score is less than 103? What is the theoretical amount in grams of pure oxygen that could be produced by 10.0 kilograms of H2O? Como resuelvo la siguiente identidad? cotg x / sec x = 1/sen x? Is there any effect of electron donating group on reducing power of reagent? If V1 is 30km per hour and v2 is 50 in the opposite way is V=V2-V1, that is 20 ?