If cos-1 x+cos-1y+cos-1 z=pi,P.T. x2+y2+z2+2xyz=1. What is the difference between finding value of sin-1(sin3pi/5) & finding principal value of inverse trig. fn? Since,a finding principal value of means we are finding value within the principal range.But in our textbooks,Principal value of cos-1(-1/2)=2pi/3which does not belong to prin. range

Asked by Sruti S | 24th Jan, 2012, 09:44: AM

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Answered by  | 25th Jan, 2012, 05:09: PM

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