exam Maths Puzzle Numerical Ability

Find all solutions to the equation cos x = -1.

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exam Other Question

How do you subtract 3x/2x-3 - 3x-6/2x^2+x-6? Find the pH if H+ = 2.68 * 10^-3 mole per liter. (pH = - logH+ or 10^-pH = H+)