Question 1124964
{{{ (sin(A + B))/(sinA*cosB) = 1 + cotA*tanB }}}

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{{{(sin(A)cos(B)+cos(A)sin(B))/(sin(A)cos(B))}}}


{{{(sin(A)cos(B))/(sin(A)cos(B))+(cos(A)sin(B))/(sin(A)cos(B))}}}


{{{1+((cos(A))/(sin(A)))((sin(B))/(cos(B)))}}}


and then one more step.