PLEASE IT'S VERY EASYQUES. TO SOLVE
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tan²A - 4tanA + 1 = 0
==> tan²A - 4tanA = -1
==> tanA( tanA -4 ) = -1
==> ( tanA -4 ) = -1/tanA
==> tanA - 4 = -cosA
==> tanA + cosA = 4
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