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1.2.3 Associativity (i) Whole numbers Recall the associativity of the four operations for whole numbers through this table: Operation Numbers Remarks Addition ……… Addition is associative Subtraction ……… Subtraction is not associative Multiplication begin{aligned} & text { Is } 7…

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Pythagoras Theorem

Let (y = cos^2x) Then, (y = (cos x)^2) Using the chain rule, (dy/dx = 2(cos x)(-sin x)) (dy/dx = -2(cos x)(sin x)) Therefore, the derivative of (cos^2x) is (-2(cos x)(sin x)).

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