RUMUS TRIGONOMETRI

  1. images (9)I.            RUMUS HASIL KALI SINUS DAN KOSINUS

(1)   2 sinA cos B = sin(A + B) + sin(A – B)

(2)   2 cos A sin B = sin(A + B) – sin(A – B)

(3)   2 cos A cos B = cos(A + B) + cos(A – B)

(4)   2 sin A sin B = – cos(A + B) + cos(A – B)

  1. II.         RUMUS JUMLAH DAN SELISIH SINUS DAN KOSINUS

(1)   sin A + sin B = 2 sin (A + B) cos (A – B )

(2)   sin A – sin B = 2 cos (A + B) sin (A – B)

(3)   cos A + cos B = 2 cos (A + B) cos (A – B)

(4)   cos A – cos B = -2 sin (A + B) sin (A – B)

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