(cot A cos A )/( cot A+cos A)=(cot A -cos A)/(cot A cos A)
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( cot A cos A )^2 = (cot A + cos A) (cot A - cos A)
Step-by-step explanation:
(cot A cos A )/( cot A+cos A)=(cot A -cos A)/(cot A cos A)
cross multiply,
(cot A cos A )(cot A cos A)=(cot A -cos A)( cot A+cos A)
the RHS is in the format (a + b )(a + b)
that is,
(a + b)^2
(a + b)^2= (a+b) (a-b)
that is,
(cot A + cos A ) ( cot A - cos A)
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