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1 + (sen^2(Q) / cos^2(Q)
mcm: cos^2(Q)
cos^2(Q)/cos^2(Q) + sen^2(Q)/cos^2(Q)
cos^2(Q) + sen^2(Q)/ cos^2(Q)
Se sabe que cos^2(Q)+sen^2(Q)=1
Por lo tanto te queda
1/ cos^2(Q)
= sec^2(Q)