Is it possible to write something like this?

\draw[dotted] (pi*0.5,sin(pi*0.5)) -- ++(10,0);

I would like to use the trigonometric functions when entering x, y-parts of the coordinates. I got Package Tikz error. It is incorrect syntax, or this method is not possible?


Yes, put braces around your functions.

\draw[dotted] ({pi*0.5},{sin(90)}) -- ++(10,0);

But use degrees otherwise you need to enter <number> r to indicate that they are radians. So the second coordinate is just 1.decimals hence the sine is close to zero but not zero. See the manual for math operations.

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