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= - sin 15°
= - sin (45-30)°
= - (sin 45° cos 30° - cos 45° sin 30°)
= - (1/2√2.1/2√3 - 1/2√2.1/2)
= - ( 1/4√6 - 1/4√2)
= 1/4√2 - 1/4√6