Tentukan Sin 75 + Cos 75
Jawaban Terkonfirmasi
Sin 75° + cos 75°
= sin (45° + 30°) + cos (45° + 30°)
= (sin 45° cos 30° + cos 45° sin 30°) + (cos 45° cos 30° – sin 45° sin 30°)
= (1/2 √2 x 1/2 √3 + 1/2√2 x 1/2) + (1/2 √2 x 1/2 √3 – 1/2 √2 x 1/2)
= (√6 + √2)/4 + (√6 - √2)/4
= (√6)/2