Respostas

2013-07-03T18:51:43-03:00

y = cos 90° - cos 180 °/cos60 ° cos 0 ° + cos 90°

y=(0)-((-1)/(1/2))(1)+(0)

y=0-(-2)(1)+0

y=0-(-2)+0

y=0+2+0

y=2

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