Question 1153565


{{{1/(csc(A-1)) + 1/(csc(A+1))}}}.......use identity {{{csc(x)= 1/sin(x)}}}

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 ={{{1/(1/sin(A-1)) + 1/(1/sin(A+1))}}}


 ={{{sin(A-1) + sin(A+1)}}}...........use identity {{{sin(A-1)=sin(A) cos(1) - cos(A) sin(1)}}} and  {{{sin(A+1)=sin(A) cos(1) + cos(A) sin(1)}}}


={{{sin(A) cos(1) - cos(A) sin(1) +sin(A) cos(1) + cos(A) sin(1)}}}...simplify


={{{sin(A) cos(1) -cross( cos(A) sin(1) )+sin(A) cos(1) + cross(cos(A) sin(1))}}}


={{{sin(A) cos(1) +sin(A) cos(1) }}}


={{{2sin(A) cos(1) }}}