Trignomentry look at6 pic
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Step-by-step explanation:
(2cos theta -1)(cos theta-3) = 0
either (2cos theta - 1) = 0 or (cos theta- 3)= 0
cos theta = 1/2 or cos theta= 3
As we know that, values of cos theta lies from -1 to 1
therefore, permissible value of cos theta is 1/2.
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