How do you find the exact value of span class=math inlinemath xmlns=http://www.w3.org/1998/Math/...

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How do you find the exact value of span class=math inlinemath xmlns=http://www.w3.org/1998/Math/MathMLmic/mimio/mimis/mimo /momn36/mn/math/span using the sum and difference, double angle or half angle formulas?
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