I need help with doing this question.
given: Sin[x+y] Cos[x+y+z]
Define using Patterns a rule (specifically a list of 2 rules ) , the two adding rules for trigonometric functions sin (a + b ) = sin ( a) cos ( b ) + cos ( a) sin ( b ) and cos (a + b) = cos (a) cos ( b) - sin (A) sin(b) applies .
thanks for your help!
thanks for the fast answer. I've send the wrong exercise. they are two different excersices.
not both together sorry.