(Unifenas - MG) O valor numérico da expressão?

y = cos (x - 60º) + sen (30º - x) / cos (x + 30º) + cos (x - 30º) é:

a)V2/2

b) 2V3/3

c)V3/3

d)V3/2

e) 1

V=raíz quadrada

Me expliquem detalhadamente

Para o dia 02/07/08

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