[" थयाक क(डो "[1-24]" : "],[" 1."4(tan^(-1)(1)/(3)+cos^(-1)(2)/(sqrt(5)))=pi]

if tan^(-1)(1/x)+cos^(-1)(2/sqrt5)=pi/4 then x equals

if tan^(-1)(1/x)+cos^(-1)(2/sqrt5)=pi/4 then x equals

cos^(-1)(-1/4)=pi+tan^(-1)(-sqrt(15))

Prove that tan ^(-1) ""(1)/(4) + tan ^(-1) ""(2)/(9) = cos ^(-1) ((2)/(sqrt5))

tan ^ (- 1) ((1) / (4)) + tan ^ (- 1) ((2) / (9)) = cos ^ (- 1) ((2) / (sqrt (5)))

Prove that : 2tan^(-1)(1/5)+sec^(-1)((5sqrt(2))/7)+2tan^(-1)\ 1/8=pi/4

cos^(-1).(2)/(sqrt(5)) + tan^(-1).(1)/(3) =

Prove that: sin^(-1)(-4/5)=tan^(-1)(-4/3)=cos^(-1)(-3/5)-pi

Prove that tan^(-1).(1)/(sqrt2) + sin^(-1).(1)/(sqrt5) - cos^(-1).(1)/(sqrt10) = -pi + cot^(-1) ((1 + sqrt2)/(1 - sqrt2))