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Is |t a n x+cot x|<|t a n x|+|cot x| tru...

Is `|t a n x+cot x|<|t a n x|+|cot x|` true for any `x ?` If it is true, then find the values of `xdot`

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Since tan x and cot x have always the same sign `| tan x + cot x | lt | tan x| + | cot x | ` does not hold true for any value of x.
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