Question

33.
(i) If cot x cot y = 2, show that cos(x + y) /cos(x - y)=1/3
(ii) If tan A = m tan B,
prove that sinA-B/sinA+B=
m-1/m + 1
(iii) If a + B = y and
tan a
tan B
then
prove
that sin (a - b) =
sin Y
x + y​

Answer 1

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