buktikan... itu betta smua ya

[tex] \frac{1-2cos^{2} \beta }{sin \beta cos \beta } \\ =\frac{ sin^{2 \beta }-cos^{2} \beta }{sin \beta cos \beta } \\ = \frac{sin^{2} \beta }{sin \beta cos \beta } -\frac{cos^{2} \beta }{sin \beta cos \beta } \\ = \frac{sin \beta }{cos \beta } - \frac{cos \beta }{sin \beta } \\ =tan \beta -cot \beta [/tex]
terbukti
(penyelesaian harus dilihat lewat PC ya)