sin(-theta) always expands to -sin(theta)

[Jonathan Crall]

I have a matrix equation where it would be useful for the output to have a -theta inside a sine operation. However, whenever I type sympy.sin(-theta) it always expands to -sin(theta). Is there any way to disable this?

[Sartaj Singh]

Try with evaluate flag. sin(-theta, evaluate=False) should give sin(-theta).

On 9 August 2015 at 21:24, Jonathan Crall <erot...@gmail.com> wrote:

I have a matrix equation where it would be useful for the output to have a -theta inside a sine operation. However, whenever I type sympy.sin(-theta) it always expands to -sin(theta). Is there any way to disable this?

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Regards

Sartaj Singh

Mathematics and Computing,

Indian Institute of Technology,

Varanasi - 221 005 INDIA

E-mail: singhs...@gmail.com, sartaj.si...@itbhu.ac.in