105
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90 minus 75 =15 therefore 15 + 75 = 90
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.
9
sigh, 18...
6 goes into 90 exactly 15 times.