Question

Please answer trigonometry question class 10​

Answer 1

Answer:

Sin A

Step-by-step explanation:

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Answer 2

Answer:

$option \: (b) \: is \: correct.$

Step-by-step explanation:

$( \sec( \alpha ) + \tan( \alpha ) )(1 - \sin( \alpha ) ) = ( \frac{1}{ \cos( \alpha ) } + \frac{ \sin( \alpha ) }{ \cos( \alpha ) } )(1 - \sin( \alpha ) ) \\ \\ = (1 + \sin( \alpha ) )(1 - \sin( \alpha ) ) \times \frac{1}{ \cos( \alpha ) } \\ \\ = \frac{1 - { \sin( \alpha ) }^{2} }{ \cos( \alpha ) } \\ \\ = { \cos( \alpha ) }^{2} \times \frac{1}{ \cos( \alpha ) } \\ \\ = \cos( \alpha ) . \\ \\ (b) \: option \: is \: correct.$