1.

) सिद्ध कीजिए; £”! है - ००४6 X झा ‘COLA 4 cos A %‘q

Answer»

Lhs = (cotA - cosA)/(cotA+cosA)=(cosA/sinA - cosA)/(cosA/sinA + cosA)

=cosA(1/sinA - 1)/cosA(1/sinA + 1)

= (1/sinA -1)/(1/sinA+1)=(cosecA-1)/(cosecA+1) since 1/sinA= cosecA=RHS



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