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	Cos-1(1-a2/1+a2)-cos-1(1-b2/1+b2)=2tan-1(a-b/1+ab) (Mathematics by Pawan Kumar Chauhan) View
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	if sin^-1(2a/1+a^2) + cos^-1(1-b^2)/(1+b^2) = tan^-1(2a/1-x^2) the prove that ... (Doubtnut) View
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	If cos^-1 x/a+cos^-1 y/b =a, then prove that x^2/b^2 -2xy/ab cosa + y^2/b^2 =sin^2 a, CLASS 12 MATHS (GURUDEV CLASSES ) View
	If `tanB= (nsinA cosA)/(1-ncos^2A)`then `tan(A +B)` equals (Doubtnut) View
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$Download Lagu Prove that: `tan{pi/4+1/2\ cos^(-1)(a/b)}+tan{pi/4-1/2\ cos^(-1)(a/b)}=(2b)/a`$	Prove that: `tan{pi/4+1/2\ cos^(-1)(a/b)}+tan{pi/4-1/2\ cos^(-1)(a/b)}=(2b)/a` (Doubtnut) View
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