Are the following statements true or false? If a statement is false, explain why or give an example that shows why it is false.
a. cos(x + 2π) = cosx
b. sin{x + π) = sinx
c. tan(x + π) = tan x
d. csc (-x) = cscx
e. cos(-x)= cosx
f. -sin(֊x) = sin x
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