define integer to simplify trigonometric functions

• Subject: define integer to simplify trigonometric functions
• From: anonymous
• Date: Wed, 19 Oct 2011 22:02:59 +0200

Dear Sir or Madam,

is it possible to tell Maxima that the variable n is an integer, so that 
Maxima will automatically simplify expressions like
sin( n*%pi ) = 0,
cos (n*%pi ) = (-1)^n ?

Best regards,

Sebastian

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