Question

if sin a =4/5andcosb=5/13find value of 1)sin(a+b)​

Answer 1

Step-by-step explanation:

sina=4/5

cosa=√1-sin^2a

=3/5

cos b=5/13

sinb=12/13

sin(a+b)=sinacosb+cosasinb

=4×5/5×13 + 3×12/5×13

=56/65