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How do you graph $y = tan (x + 90)$ $y=tan(x+90)$ ?

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Konstantinos Michailidis

Mar 17, 2016

Because $y = tan (x + \frac{π}{2}) = - cot x$ $y=tan(x+pi/2)=-cotx$ hence its the graph of $cot x$ $cotx$ only in the opposite direction.

The image below show the graphs of $cot x$ $cotx$ (red line) and $- cot x$ $-cotx$ (green line)

enter image source here

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