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OpenStudy (anonymous):
Why for a small q can you say cos q = 1 – ½q 2.
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OpenStudy (anonymous):
sorry that's cos q= 1- .5q^2 where q is an angle
OpenStudy (anonymous):
(how do you derive that)
OpenStudy (mertsj):
Because the cosine of 0 is 1 and .5q^2 is near 0 for small values of q
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