how to change rotation angle into slope of line?

Question:how to change rotation angle into slope of line?

Posted: ComputerUser 535 Product: Maple 2015

September 10 2016

with(MTM):
evalf(solve(atan(-1) - 45*Pi/180 = atan(x), x))*180/Pi;

above can not be solved

if angle is 30 degree

is following correct?

with(MTM):
angle := 30:
evalf((atan(-1) - 30*Pi/180)/Pi)*(-1.0);

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