math:tan: Correct an identity.
math:tan: Correct an identity.

Signed-off-by: Mansour Moufid <ac5f6b12fab5e0d4efa7215e6c2dac9d55ab77dc@gmail.com>

parallella/pal,debug-de-su-ka/pal,olajep/pal,eliteraspberries/pal,Adamszk/pal3,olajep/pal,mateunho/pal,mateunho/pal,aolofsson/pal,mateunho/pal,parallella/pal,olajep/pal,8l/pal,parallella/pal,mateunho/pal,debug-de-su-ka/pal,eliteraspberries/pal,aolofsson/pal,parallella/pal,8l/pal,mateunho/pal,eliteraspberries/pal,debug-de-su-ka/pal,olajep/pal,Adamszk/pal3,8l/pal,debug-de-su-ka/pal,aolofsson/pal,Adamszk/pal3,debug-de-su-ka/pal,aolofsson/pal,eliteraspberries/pal,8l/pal,parallella/pal,eliteraspberries/pal,Adamszk/pal3