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\(\cfrac{sinA+sinB}{cosB-cosA}\)
\(=\cfrac{sin(90^o-B)+sin(90^o-A)}{cos(90^o-A)-cos(90^o-B)}\)
\(=\cfrac{cosB+cosA}{sinA-sinB}\)
\(=\cfrac{cosA+cosB}{sinA-sinB}\) [প্রমানিত]