1/1+Cos x + 1/1-Cos x

[tex] \frac{1}{1 + \cos(x) } + \frac{1}{1 - \cos(x) } = \\ \frac{1 - \cos(x) + 1 + \cos(x) }{(1 + \cos(x)) \: \times (1 - \cos(x)) } \\ \frac{2}{1 - ({ \cos(x) })^{2} } = \frac{2}{ ({ \sin(x) })^{2} } = 2 \times ({ \csc(x)})^{2} [/tex]
ini jawabannya
semoga membantu
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