- Differentiate the following: y=sinx?

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20 balloons have to be divided among between group a and group b inthe ratio 2:3. how many ballons will each group recieve? What would be a creative college level Astronomy 1 project? Is the domain [-3,6)? Help, double integrals, I cant get answer:
∫[from 0 to infinity] (tan−1(5x)−tan−1(2x))/(x) dx. I got:
∫[from 2 to 5] (1/(1+(xy)^2)) dy.? Indicate the number of unpaired electrons for: [noble gas] ns2np5?