(d)12 is NOT the answer ans is (c)6
cos x=cosecy
-1<=cosx<=1 -1>=cosec y>=1
equality exists only when cosx=1,-1 and cosecy=1,-1
x=0,pi,2pi,3pi and y=pi/2,3pi/2,5pi/2
no of pairs(x,y)=3*4=12 WRONG anS
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SOLNS EXIST WEN cosx =1 and cosecy=1 ie x=0,2pi y=pi/2,5pi/2 =>4solns
and
wen
cosx =-1 and cosecy=-1 ie x=pi,3pi y=3pi/2 =>2 solns
in total 6 ans