Cramer's Rule is a method for using Matrix manipulation to find solutions to sets of Linear equations.
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the rule for chains of geometric shapes
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DESCARTES Rule in math class. (geometry and up!)
You may be referring to the rule for dividing fractions. To divide one fraction by another, you invert the second fraction (exchange numerator and denominator), and multiply instead.
index of any digit is 0 then it is equal to one according to mathematics's rule. therefore a degree is equal to 1.