Question

if a1 a2 a3 are in ap with common difference d then sind.(coseca1.coseca2+coseca2.coseca3..........) is ??

Answer 1

$\huge{\colorbox{pink}{ Answer }}$

We have sin d (cosec a1 cosec a2 + cosec a2 cosec a3 + ...+ cosec an–1 cosec an