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The Brainliest Answer!
2014-10-08T18:46:13+05:30
A should be 1
because if a is 1
then 
1-cos2x=2sin^2x/2
now
lim     2sin^2x/2/xsinx=lim  [sinx/2]/x/2]*[sinx/2]/(x/2)*(x/2)/sinx=1/2
x⇒0
1 5 1