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

Because y=tan(x+pi/2)=-cotx hence its the graph of cotx only in the opposite direction. The image below show the graphs of cotx (red line) and -cotx (green line)

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How do you graph y=tan3x?

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Draw the graph of y=tan x for value of x such that -90°≤ x

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SOLUTION: determine the period of y = tan 2x