Question

sin(A)=4/5 and cos(B)=5/13 find cos (A+B)..​

Answer 1

Answer:

-33/65

Step-by-step explanation:

sin(B)=12/13 and cos(A)=3/5

cos(A+B)=cosA.cosB-sinA.sinB

=3/5×5/13-4/5×12/13

=15/65-48/65

= -33/65