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If x is a positive acute angle and cos x = radical 3 over 4, what is the exact value of sin x? Whatâ€™s the x intercept of x^2 + 4x - 8? Please explain what to do? Calculate the number of C atoms in 0.180 mole C6H14O.? Which quadrilateral has 4 congruentsides and 4 congruent angles? Flat Earthers, what Proof do you have that the pictures of earth are fake?