If tan (A + B) = p and tan (A – B) = q, then write the value of tan 2B.

5

If 12 sin x – 9 sin² x attains its maximum value at x = α, then write the value of sin α.

6

Write the interval in which the values of lie.

8

If then write the value of tan x tan y.

9

If then write the value of ab + bc + ca.