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ctg(a+10)=tg(a+40)
a+10+a+40=90
2a+50=90
2a=40
a=20
2)Hallar sen (35+a) si sec(a+40)=csc(a+20)
a+40+a+20=90
2a+60=90
2a=30
a=15
Reemplaza sen (35+a)