Proposition - (1):-
n Î R, x
¹ 0
Proposition - 
Note : All the formulae, which we have
obtained in the above propositions from (2) to (7) are valid,
only when angles are measured in radians.
Proposition - (8) If k is constant, then 
(9) 
Corollary: 
Corollary: 
Also Note that:-

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