Help dongs 1,2,3,6 beserta cara. kalau ga bisa semua. gapapa sebisanya aja
Dindayoeansas
Sin a = 5/13 cos a = 12/13 sin b = 7/25 cos b = 24/25 1. sin (a+b) = sin a cos b + sin B cos a = 5/13 x 24/25 + 7/25 x 12/13 = 120/325 + 84/325 = 204/325
sin (a-b) = sin a cos b - cos a sin b = 5/13 x 24/25 - 12/13 x 7/25 = = 120/325 - 84/325 = 36/325
2. sin a = -3/5 coa a = 4/5 cos b = -12/13 sin b = 5/13 cos (a+b) = cos a cos b - sin a sin b
cos (a-b) = cos A cos B + sin A sin B
3. cos A = 15 / 17 sin A = 8/17 tan A = 8/15 cos B = 7/25 sin B = 24/25 tan B = 24/7
maka Tan (a+b) = (tanA + tanB) : (1 - tan A tan B)
1. sin (a+b) = sin a cos b + sin B cos a
= 5/13 x 24/25 + 7/25 x 12/13
= 120/325 + 84/325 = 204/325
sin (a-b) = sin a cos b - cos a sin b = 5/13 x 24/25 - 12/13 x 7/25 =
= 120/325 - 84/325 = 36/325
2. sin a = -3/5 coa a = 4/5 cos b = -12/13 sin b = 5/13
cos (a+b) = cos a cos b - sin a sin b
cos (a-b) = cos A cos B + sin A sin B
3. cos A = 15 / 17 sin A = 8/17 tan A = 8/15
cos B = 7/25 sin B = 24/25 tan B = 24/7
maka Tan (a+b) = (tanA + tanB) : (1 - tan A tan B)
tan (a-b) = (tan A - tan B) : (1 + tan A tan B)