trigonometri
sin 150° - sin 210° - cos 300 ° sin 150° + cos 300° tan 225° - sin 300°
= sin (180 - 30)° - sin (180 + 30)° - cos (360 - 60)° sin (180 - 30)° + cos (360 - 60)° tan (180 + 45)° - sin (360 - 60)°
= sin 30° - (- sin 30°) - cos 60° sin 30° + cos 60° tan 45° - (-sin 60°)
= 1/2 + 1/2 - 1/2 × 1/2 + 1/2 × 1 + 1/2 √3
= 1 - 1/4 + 1/2 + 1/2 √3
= 1 1/4 + 1/2 √3
= 5/4 + 1/2 √3
= (5 + 2√3)/4
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trigonometri
sin 150° - sin 210° - cos 300 ° sin 150° + cos 300° tan 225° - sin 300°
= sin (180 - 30)° - sin (180 + 30)° - cos (360 - 60)° sin (180 - 30)° + cos (360 - 60)° tan (180 + 45)° - sin (360 - 60)°
= sin 30° - (- sin 30°) - cos 60° sin 30° + cos 60° tan 45° - (-sin 60°)
= 1/2 + 1/2 - 1/2 × 1/2 + 1/2 × 1 + 1/2 √3
= 1 - 1/4 + 1/2 + 1/2 √3
= 1 1/4 + 1/2 √3
= 5/4 + 1/2 √3
= (5 + 2√3)/4