Hi, I'm having trouble with the pictured problem. I understand that 1=sec^{2}-tan^{2} and 1=cos^{2}/cos^{2}, but having issues with working through 1=(1-(?))/cos^{2}. Any help would be greatly appreciated. Thanks!
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$\sec^2(\theta)-\tan^2(\theta) = \dfrac{1 - \sin^2(\theta)}{\cos^2(\theta)}=\dfrac{\cos^2( \theta)}{\cos^2( \theta)}=1$
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