- How can compute sine(36 degrees)exactly?

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A comet has a orbital radius twice that of the earth. what is the period of the comet in year? (physics question)? How would you find the vertices of an image of a figure were rotated 270 clockwise? What is f(z)=1/z^3-z^4? Write the formulas and charges for the following ions: Phosphate, nitrite, nitrate, hydroxide, carbonate, ammonium? Aluminum hydroxide is an active ingredient in maalox. what is the percentage of aluminum by mass in aluminum hydroxide?