mmm4444bot
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POST EDITED
\(\displaystyle 0 = \tan x\)
\(\displaystyle 0 = \tan (1) x\) - Note \(\displaystyle 1 * x = x\)
\(\displaystyle 0 = \tan x\)
tan(x) is a number.
If you write tan(1), that means x=1, and you're taking the tangent of 1 radian, which is about 1.5574 (rounded to four places).
If you write tan(1)x, that means the number 1.5574 times the number x.
Why are you writing tan(1)x ?
Did you tell us that 1*x = x because you're suggesting that tan(1)x somehow means tan[(1)(x)]?
I'm trying to understand why you told us that 1 times x is x...that kinda goes without saying, does it not?