diketahui sin A = 12/13 (a lancip) dan cos b = 2/5 akar 5 nilai sin (a+b)=

sin A=12/13 maka cos A = 5/13
cos B = 2v5/5 maka sin B = V5/5

sin (A+B) = sin A cos B + cos A sin B
= 12/13 × 2V5/5 + 5/13. V5/ 5
= 24V5/65 + 5V5/ 65
=29V5/65