sin172°=sin(180-8)=sin8°
cos94°=cos(90+4)= -sin4°
sin8°=sin2*4°=2*sin4°*cos4°
6*2sin4°*cos4°/ -sin4°*cos4°= -12
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sin172°=sin(180-8)=sin8°
cos94°=cos(90+4)= -sin4°
sin8°=sin2*4°=2*sin4°*cos4°
6*2sin4°*cos4°/ -sin4°*cos4°= -12