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I want calculate the m = slope of a linear line WHEN I already know the angle in degrees of the line.

Here is an example: I calculate with Excel the angle with the following function: =+DEGREES(ATAN(0.0874887)) and I get as result the angle of 5%.

But how do I calculate the value 0.0874887 that is m = slope if I already know the angle of the linear line is 5%?

Thanks