Respostas

2013-08-04T22:45:45-03:00
Sen(90-x)
sen(90)*cos(x)-cos(90)*sen(x)
1*cos(x)-0*sen(x)
cos(x)
-------------------------------------
sabemos que:
cos(x)=sen(x)/tan(x)
cos(x)=a/b
2 1 2