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E= 6sen 30º- tg 45º+ 5sen 37º
E= 6. 1/2 - 1+ 5. 3/5
E= 3-1+3
E=5
resolver:
3x.tg53° -ctg45°=x+sec60°
3x.4/5 -1= x+ 2
12x/5 -1= x+2
12x/5= x+3
12x= 5x+15
7x=15
x= 15/7