If sin-1 2a/1+a2- cos-11-b​2/1+b2= tan-12x/1-x2 then prove that x = a-b/1+ab. plse reply fast

  • 2
sin-1 2a/1+a^2 = 2 tan-1 a (property)
similarly for cos and tan.
it becomes tan-1 a  -tan-1b  = tan-1 x 
use property
  • 11
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