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Write the solution set of the equation `(2costheta+1)(4costheta+5)=0`in the interval `[0,2pi]` |
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Answer» `(2costheta+1)(4costheta+5) = 0` `=>(2costheta+1) = 0 or (4costheta+5) = 0` `=>costheta = -1/2 or cos theta = -5/4` But, minimum value of `cos theta` is `-1`, so `costheta != -5/4.` `:. costheta = -1/2` `=>theta = (2pi)/3,(4pi)/3.` |
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