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como: sin(90+x)=cosx y asi existen muchas...
solucion:
sin(90+30)tg(360-30) - cos(270-45)/cos(90+45)
cos(30)(-tg(30)) - (-sen(45))/ (-sen(45))
-(√3/2)*(√3/3) - 1
-3/6 - 1
-3/2