How to solve -.48 = cos(π/10 x)?
I'm supposed to end up with 2.071 but I don't know how to get it. Then my final results are: x=6.59 and x=13.4
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I'm supposed to end up with 2.071 but I don't know how to get it. Then my final results are: x=6.59 and x=13.4
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I'm guessing either there is an error in your book, or you copied the problem down incorrectly.
I get the same answers that you got.
ZERO at x = 6.593633445228829
and
x = 13.406366554771173