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Plot[Cos[x] ( Tan[x] - 1 ), {x, 0, 2 Pi}, Ticks -> {Table[{n Pi/4, n Pi/4}, {n, 0, 8}], Automatic}]
Plot[Cos[x] ( Tan[x] - 1 ), {x, 0, 2 Pi}, Ticks -> {Table[{n Pi/4, n Pi/4}, {n, 0, 8}], Automatic}]
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