[ A ] a 

[ B ] b  
[ C ] c  
[ D ] d 
[ A ] a 

[ B ] b  
[ C ] c  
[ D ] d 
Answer : Option A 
Explanation : 
sin (15Âº) = sin (45Âº â€“ 30Âº) = sin 45Âº cos30Âº â€“ cos30Âº sin 45Âº = $1\over\sqrt2$ x $\sqrt3\over2$  $1\over2$x $1\over\sqrt2$ = $\sqrt31\over2\sqrt2$ 
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