Question

Trig help ..............

Answer 1

SinA = 3/5
cosA = 4/5

cosB = 3/5
sinB = 4/5


sin(A+B) = sinAcosB + cosAsinB

= (3/5)(3/5) + (4/5)(4/5)
= 9/25 + 16/25
=(9+16)/25
=25/25
=1

therefore, the answer is B