Tentukan nilai dari sin 555⁰​

1/4 (√2 – √6)

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= sin 555°

= sin (360° + 195°)

= sin 195°

= sin (180° + 15°)

= – sin 15°

= – (sin 45° cos 30° – sin 30° cos 45°)

= – (1/2 √2 (1/2 √3) – 1/2 ( 1/2 √2 ))

= – (1/4 √6 – 1/4 √2))

= – 1/4 √6 + 1/4 √2

= 1/4 (-√6 + √2)

= 1/4 (√2 – √6)