Trigonometric Relations

sin 0 = 0, so should not be used to add, subtract, multiply or divide . This is similar to :
2 x 0 = 0
3 x 0 = 0
so 2 x 0 = 3 x 0
so 2 = 3 ???



2009-08-04 14:41:56 補充：
Also, sin is a function that does not follow distributive law. Just like sqrt ( 3 + 2) is
not equal to sqrt 3 + sqrt 2.