Tolong di jawab Mate ini, dgn penjelasan yg benar

A. -297/425

Penjelasan dengan langkah-langkah:

Sin A = 15/17

Cos A = √17²-15²

Cos A = √289-225

Cos A = √64

Cos A = 8

Cos A = 8/17

Sin B = 7/25

Cos B = √25²-7²

Cos B = √625 – 49

Cos B = √516

Cos B = 24

Cos B = -24/25

Cos(A+B) = cosA.cosB-sinA.sinB

= 8/17.-24/25-15/17.7/25

= -192/425 – 105/425

= -297/425