- I need help with this one: The integral from (0 to 1) [r^3/(square root 4+r^2) dr]?

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How does sin pi/12= sin 11pi/12? Using the opposite angle identities? Calculate the wavelength of light emitted (in nm) from a hydrogen electron that jumps from n = 2 to n = 5.? Is the earth flat or a sphere and i want proof? How much is cost for taxid in ms? How many molecules of propane were in the Erlenmeyer flask? Avogadro's number is 6.022 × 10^23 molecule/mol.
0.274g (mass in flask) 44.10=MM?