jika diketahui tan A = 12/5 dan tan B 8/15, hitunglah nilai dari sinA cosB + cosA sinB

Tan A = 12/5 = de/sa => mi = √(12^2 + 5^2) = √(144 + 25) = √169 = 13
Sin A = de/mi = 12/13
Cos A = sa/mi = 5/13

Tan B = 8/15 = de/sa => mi = √(8^2 + 15^2) = √(64 + 225) = √289 = 17
Sin B = de/mi = 8/17
Cos B = sa/mi = 15/17
Sin A cos B + cos A sin B
= 12/13 . 15/17 + 5/13 . 8/17
= 180/221 + 40/221
= 220/221

Q. E. D. ........analisis vektorilisis desimal jadi menggunakan jumlah bilangan nonrasional