- Find the exact value of the expression: cot((sin^-1(8/9))?

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Determine the ratio of the electric force to gravitational force between proton and electron in hydrogen atom (d=10^(-10)m)? Chemist burns 100g of chromium in excess oxygen.Only one product and it has a mass of 192.31g.What is the empirical formula of this product? The line 12x+5y=60 forms a triangle with the coordinate axes. What is the sum of the lengths of the altitudes of this triangle? Two positive integers are relatively prime if they have no common factor. How many two-digit numbers are relatively prime with 24? Give reasons for selecting star-star and star-delta transformer configuration instead of two star-star configuration for 12-pulse converter.?