Buktikan identitas trigonometri berikut: [tex]\displaystyle \frac{1-\sin^2 x~\cos^2 x}{\cos^4 x}=\tan^4 x+\tan^2 x+1[/tex]
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Buktikan identitas trigonometri berikut:
[tex]\displaystyle \frac{1-\sin^2 x~\cos^2 x}{\cos^4 x}=\tan^4 x+\tan^2 x+1[/tex]
[tex]\displaystyle \frac{1-\sin^2 x~\cos^2 x}{\cos^4 x}=\tan^4 x+\tan^2 x+1[/tex]
