Page 11 - Tugas MuPM ke - 4 oleh Artha Taruji Borneo Hutagaol
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6. Rumus Perkalian Sinus Cosinus Trigonometri
2 sinxcosy = sin(x + y) + sin(x - y)
2 cosxsiny = sin(x + y) - sin(x - y)
2 cosxcosy = cos(x + y) + cos(x - y)
-2 sinxsiny = cos(x + y) - cos(x - y)
