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Pre-calculus - How to find the exact value by using the sum of two angles formula with cosine

👉 Learn how to evaluate the cosine of an angle in radians using the sum/difference formulas. To do this, we first express ...
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Pre-calculus - How to evaluate a logarithm using the change of base formula, 1.06^x = 4.1

👉 Learn how to evaluate logarithms using a change of base formula. The change of base formula states that when we have a log of a to the base of b, we can evaluate the logarithm by using a common ...