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If cos–1 x/2 + cos–1y/3 = a, then prove that 9x2–12xy cos a + 4y2 = 36 sin2 a.
Given:-
Take
We know that, Formula
Thus,
⇒
⇒
⇒
⇒
Now lets take square of both side, we get
⇒
⇒
⇒
⇒
⇒
⇒
Hence Proved