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cos²x(sen²x+cos²x)=1
cos²x
(simplificos cos²x
sen²x+cos²x=1
1=1
c)sec²x.cot²x=1+cot²x
1/cos²x.cos²x/sen²x=1+cos²x/sen²x
1/sen² =sen²x+cos²x
sen²x
1/sen²x=1/sen²x