Question

Sin=3/5, sin b=4/5 Tentukan a dan b lancip

Answer 1

Sin A = 3/5 , cos A = 4/5
sin B = 4/5, cos B = 3/5

sin (A+B) =  sin A cos B + cos A sin B
sin (A+B) = (3/5)(3/5) + (4/5)(4/5) = 1

sin (A-B) = sin A cos B - cos A sin B
sin (A-B) = (3/5)(3/5) - (4/5)(4/5) =(9-16)/(25) = 7/25