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at -90 degrees the value of cos(x) is 0.
-1. This is attained for x = 270 degrees ( + k*360 degrees for all integers k)
2x-57 degrees = -55
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.
It is the Roman number for 10.