CALCULAR:
E=(4sen2º+3cos88º)csc2º
cos88=sen2
E=(4sen2+3sen2)csc2
E=7(sen2)(csc2)----------------------senx*cscx=1
E=7
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cos88=sen2
E=(4sen2+3sen2)csc2
E=7(sen2)(csc2)----------------------senx*cscx=1
E=7