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)
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.
2x-57 degrees = -55
It is the Roman number for 10.
cos20 x cos40 x cos80 = 0.0300 radians = 0.125 degrees (the value for radians is given to four decimal places, the value in degrees is exact)
at -90 degrees the value of cos(x) is 0.
Summing these you have the sum of the angles = 3x + 3x + x + x = 8x. Since any quadrilateral sums to 360, then 360 = 8x, and x = 45.
-1. This is attained for x = 270 degrees ( + k*360 degrees for all integers k)
The answer will depend on what x is!
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.
2x-57 degrees = -55
It is the Roman number for 10.
45 degrees with respect to what?
It is: x = 4.5 and so the acute angles are 36 degrees and 54 degrees
From the given information the value of x works out as 16
Yes; a line at 45 degrees.