Equals sin x divided by cos x. In a right-angled triangle it is the ratio of the two shorter sides, the one opposite the angle called x, divided by the the side closest to x.
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To solve for tan x degree 90 you do a few things. First, if x equals 90, then this equals 1.5597 radian or 89.36 degrees. This is the easiest way to solve tan x degree 90.
sec(x)tan(x)
22
tan(3x)=1 3x= PI/4 x=PI/12 is the smallest positive number
tan(x)*csc(x) = sec(x)