Sudut Negatif

\(\color{blue} \sin (-\alpha) = -\sin \alpha\) \(\color{blue} \cos (-\alpha) = \cos \alpha\) \(\color{blue} \tan (-\alpha) = -\tan \alpha\)   \(\color{blue} \csc (-\alpha) = -\csc \alpha\) \(\color{blue} \sec (-\alpha) = \sec \alpha\) \(\color{blue} \cot (-\alpha) = -\cot \alpha\)  

CONTOH SOAL

  Soal 1 Tentukan nilai \(\sin (-240^{\circ})\)   Soal 2 Tentukan nilai \(\cos (-315^{\circ})\)     Soal 3 Tentukan nilai \(\tan (-300^{\circ})\)