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# How would I evaluate this?

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(1-cos^2(x))/(1-cos(x))

Guest Jul 11, 2017
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How would I evaluate this?

(1-cos^2(x))/(1-cos(x))

$$\begin{array}{|rcll|} \hline && \frac{1-cos^2(x)} { 1-cos(x) } \\ &&& \Big( 1-cos(x) \Big) \Big(1+cos(x) \Big) = 1-cos^2(x) \\ &=& \frac{\Big( 1-cos(x) \Big) \Big(1+cos(x) \Big)} { \Big(1-cos(x) \Big) } \\ &=& 1+cos(x) \\ \hline \end{array}$$

heureka  Jul 11, 2017

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