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
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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
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