Question

$tg(x) sen(x) + cos(x) = sec(x)$
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Answer 1

1. tan(x) sen(x)+cos(x)=sec(x)
2. (sen(x)/cos(x)) sen(x) + cos(x) = sec(x)
3. sen^2(x)/cos(x) + cos(x) = sec(x)
4. (sen^2(x) + cos^2(x)) / cos(x) = sec(x)
5. 1/cos(x) = sec(x)
6. sec(x) = sec(x)