sin 330° cos 300° + tan 150° tan 240°
= (sin (360 - 30)° × cos (360 - 60)°) + (tan (180 - 30)° × tan (180 + 60)°)
= (- sin 30° × cos 60°) + (- tan 30° × tan 60°)
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sin 330° cos 300° + tan 150° tan 240°
= (sin (360 - 30)° × cos (360 - 60)°) + (tan (180 - 30)° × tan (180 + 60)°)
= (- sin 30° × cos 60°) + (- tan 30° × tan 60°)