Question

can any one answer this question

please correct this answer ​

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

By rationalizing the given question, we have

$\frac{(1 - \cos( \alpha )) }{(1 + \cos( \alpha )) } = \frac{ {(1 - \cos( \alpha )) }^{2} }{1 - { \cos( \alpha ) }^{2} }$

Using

${ \sin( \alpha ) }^{2} + { \cos( \alpha ) }^{2} = 1$

$\frac{(1 - \cos( \alpha )) }{(1 + \cos( \alpha )) } = { \frac{(1 - \cos( \alpha )) }{ \sin( \alpha ) } }^{2}$

$= {( \frac{1}{ \sin( \alpha ) } - \frac{ \cos( \alpha ) }{ \sin( \alpha ) } ) }^{2}$

$= {( \csc( \alpha ) - \cot( \alpha )) }^{2}$

Hence proved.