Question
Sat April 19, 2014 By: Jerrin Thomas

If sin-1[ 2a / (1+a^2) ] + sin-1[ 2b / (1+b^2) ] = 2tan-1x , prove that x = (a+b)/(1-ab)

Expert Reply
Sun April 20, 2014
U s e space t h i s space f o r m u l a : 2 tan to the power of minus 1 end exponent x equals sin to the power of minus 1 end exponent open parentheses fraction numerator 2 x over denominator 1 plus x squared end fraction close parentheses
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