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sen(x)/cos(x)+cos(x)/sen(x)=sec(x) × csc (x)
sen²(x)+cos²(x)/sen(x)×cos(x)=sec(x) × csc (x)
1/sen(x)×cos(x)=sec(x) × csc (x)
1/sen(x) × 1/cos(x)=sec(x) × csc (x)
csc(x) × sec(x)=sec(x) × csc (x)
sec(x) × csc(x)=sec(x) × csc (x)
l.q.q.d