Q. 254.5( 8 Votes )

If cosec</s

Answer :

It is given


...(1)


We know that,







Adding (1) and (2)


We get





We know








( (a + b)2 = a2 + b2 + 2.a.b)




(( (a–b)2 = a2 + b2–2.a.b)



Hence Proved.


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