Odpowiedź:
(sin 120 stopni - sin 150 stopni)(cos120 stopni + cos 150 stopni)=
(sin(90°+30°)-sin(90°+60°)(cos(90°+30°+cos(90°+60°))=
(cos30°-cos60°)(-sin30°-sin60°)=
(√3/2-1/2)(-1/2-√3/2)=-√3/4-3/4+1/4+√3/4=-1/2
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Odpowiedź:
(sin 120 stopni - sin 150 stopni)(cos120 stopni + cos 150 stopni)=
(sin(90°+30°)-sin(90°+60°)(cos(90°+30°+cos(90°+60°))=
(cos30°-cos60°)(-sin30°-sin60°)=
(√3/2-1/2)(-1/2-√3/2)=-√3/4-3/4+1/4+√3/4=-1/2