That is not correct. "tan x" is a function that depends on the value of "x"; it is not always pi.
tan(x) is pi only if 'x' is about 72.3 degrees, 252.3 degrees, or either of these added to a multiple of 360 degrees.
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pi radians.
1 because tan(5 pi / 4) = 1
Tanx was created in 1972-10.
(tanx+cotx)/tanx=(tanx/tanx) + (cotx/tanx) = 1 + (cosx/sinx)/(sinx/cosx)=1 + cos2x/sin2x = 1+cot2x= csc2x This is a pythagorean identity.
(-x+tanx)'=-1+(1/cos2x)