2nd way: Derivative arc cos(x/a) Calculus

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2 ways: sq root derivative 1/(√√(1/√x))

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prob stat: Compute Var(X) when X represents the outcome when we roll a fair die.

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4 ways: trig integral ∫tan(x) dx

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trig integral ∫1/(√sin(x) √cos^7(x)) dx

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