- Why our earth is round?

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I need help bad. Please provide an answer in step by step Prove the identity. 1-cosx/1+cosx=(cscx- cot x)^2? If 425 mL of sodium chloride is present in 5 L of solution, what is the percentage by volume of sodium chloride? How do I show work that this is no solution 5 sec x + 5 tan x = 5? Three men alpha beta and gamma...? How many cm in the ears does the holes go in the air before it reaches the brain?