Question

Tolong dibantu nomor 8

Answer 1

Verified answer

Sin A = 3/5 = de/mi => sa = √(5^2 - 3^2) = √(25 - 9) = √16 = 4
Cos A = sa/mi = 4/5

Cos B = 1/2 √3 => cos B = cos 30° => B = 30°
Sin B = sin 30° = 1/2

Sin (A + B) = sin A cos B + cos A sin B
= 3/5 . 1/2 √3 + 4/5 . 1/2
= 3/10 √3 + 4/10
= 1/10 (3√3 + 4)