Penjelasan dengan langkah-langkah:

1) Cos 330° → cos di kuadran 4 positif

= cos (360° – 30°)

= cos 30°

= √3

2

2) sec 315° → sec dikuadran 4 positif

= sec (360 – 45)°

= sec 45°

= √2

3) sin 120° + cos 210° – tan 225°

positif + negatif – positif

= sin (180° – 60°) + cos (180° + 30°) – tan (270° – 45°)

= sin 60° – cos 30° – tan 45°

= √3 – √3 – 1

2 2

= 0 – 1

= – 1

4) 4 tan 45° – 2 cos 60° + √3 sin 60°

= 4 × 1 – 2 × 1+ √3 × √3

2 2

= 4 – 2 + √9

2 2

= 4 – 1 + 3

2

= 3 + 1½

= 4½

5) sin 300° × cos 135°

tan 225°

= sin (360 – 60)° × cos (180 – 45)°

tan (180 + 45)°

= – sin 60° × ( – cos 45°)

tan 45°

– √3 × (– √2 )

= 2 2

1

= √6

4