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Can someone please help me work out how to get to the answer of:

tanx + tan (pi-x) + cot (pi/2+x) = tan (2pi-x)

1 answer

tan (pi-x) = -tan(x)
cot(pi/2+x) = -tan(x)
tan(2pi-x) = -tan(x)

now things fall out.

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