cos 47.sin17-sin47.cos=1/2
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by using the formula
sin(a-b)=sina*cosb-cosa*sinb
here a=47 and b=17
therefore
sin(47-17)=sin30
=> sin 30=1/2= rhs
sin(a-b)=sina*cosb-cosa*sinb
here a=47 and b=17
therefore
sin(47-17)=sin30
=> sin 30=1/2= rhs
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