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Sa se calculeze sin 150°/cos120°

Răspuns :


sin150°=sin(180°-30°)=sin30°
cos120°= -cos(180°-60°)= -cos60°
sin30°=1/2=)cos60°= -1/2
sin150°/cos120°=sin150°:cos120°=-1
sin150°/cos120°=?
sin150°=sin(180°-30°)=sin30°
cos120°= -cos(180°-60°)= -cos60°
sin30°=1/2
-cos60°= -1/2
=> sin150°/cos120°=sin150°:cos120°=
1/2:(-1/2)=1/2*(-2/1)=(-2/2)= -1