Question 1073218
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It is the same value of {{{theta}}}, for which {{{cos(theta)}}} = {{{-sqrt(2)/2}}}, i.e. {{{theta}}} = {{{3pi/4}}} (135 degs) or {{{theta}}} = {{{5pi/4}}} (225 degs).


The tutor "MathTherapy" missed one solution.
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