Question

if cos (x-y) =3/5 and tan x tan y =2 then

a. cos x cos y =1/5
b. sin x sin y = -2/5
c. cos (x+y) =-1/5
d. none​

Answer 1

Answer:

If cos (x-y) =3/5 and tan x tan y =2 then

a. cos x cos y =1/5

b. sin x sin y = -2/5

c. cos (x+y) =-1/5

d. none

the answers of this question is

a. cos x cos y =1/5