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Graphs of Tangent, Cotangent, Secant and Cosecant

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Zeros of tan (x)
all integer multiples of π
Asymptotes of tan (x)
all odd multiples of π/2
Zeros of cot (x)
all odd multiples of π/2
Asymptotes of cot (x)
all integer multiples of π
Asymptotes of sec (x)
all odd multiples of π/2