Wie vereinfacht man (sec ^ 2x) - (tan ^ 2x) ?
Antworten:
sec^2 x - tan^2 x = 1
Erläuterung:
Beachten Sie, dass:
sin^2 x + cos^2 x = 1
Daher:
cos^2 x = 1 - sin^2 x
und wir finden:
sec^2 x - tan^2 x = 1/cos^2 x - sin^2 x/cos^2 x
color(white)(sec^2 x - tan^2 x) = (1 - sin^2 x)/cos^2 x
color(white)(sec^2 x - tan^2 x) = cos^2 x/cos^2 x
color(white)(sec^2 x - tan^2 x) = 1