Turito Academy

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<p class="Cell">If <img src="data:image/png;base64,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" class="Wirisformula" alt="0 less or equal than x less than 2 pi" width="76" height="13" style="vertical-align:-1px" role="math" data-mathml='«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»0«/mn»«mo»§#8804;«/mo»«mi»x«/mi»«mo»§#60;«/mo»«mn»2«/mn»«mi»§#960;«/mi»«/math»'/>, then the number of real values of x, which satisfy the equation<img src="data:image/png;base64,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" class="Wirisformula" alt="cos invisible function application x plus cos invisible function application 2 x plus cos invisible function application 3 x plus cos invisible function application 4 x equals 0" width="256" height="13" style="vertical-align:-1px" role="math" data-mathml='«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»cos«/mi»«mo»§#8289;«/mo»«mi»x«/mi»«mo»+«/mo»«mi»cos«/mi»«mo»§#8289;«/mo»«mn»2«/mn»«mi»x«/mi»«mo»+«/mo»«mi»cos«/mi»«mo»§#8289;«/mo»«mn»3«/mn»«mi»x«/mi»«mo»+«/mo»«mi»cos«/mi»«mo»§#8289;«/mo»«mn»4«/mn»«mi»x«/mi»«mo»=«/mo»«mn»0«/mn»«/math»'/> is :