Question

pls answer this question​

Answer 1

$\cos( \alpha ) \div \sin( \alpha ) - \sin( \alpha ) \div \cos( \alpha )$

${ \cos( \alpha ) }^{2} - { \sin( \alpha ) }^{2} \div \sin( \alpha ) \cos( \alpha )$

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

hence LHS=RHS

proved

Answer 2

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