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Prove that: cos–1 4/5+cos–1 12/3=cos–1 33/65
We know that, Formula
If cos–1 x/2 + cos–1y/3 = a, then prove that 9x2–12xy cos a + 4y2 = 36 sin2 a.
Solve the equation: cos–1 a/x–cos–1 b/x =cos–1 1/a
Solve: cos–1 √3x+cos–1x= π/2