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" (i) "(tan^(2)A-1)/(tan^(4)A-1)=cos^(2)...

" (i) "(tan^(2)A-1)/(tan^(4)A-1)=cos^(2)A

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Prove that (tan^(2)A-1)/(tan^(4)A-1)=cos^(2)A

If 3 cot A = 4 , check whether (1-tan^(2)A)/(1+tan^(2)A)=cos^(2)A-sin^(2)A is true or not.

If quad 3cot A=4 check whether (1-tan^(2)A)/(1+tan^(2)A)=cos^(2)A-sin^(2)A or not.

Prove the following: tan^(-1)(1/4)+tan^(-1)(2/9)=1/2cos^(-1)(3/5)

Pove that i) tan^(-1)1/2+tan^(-1)2/11=tan^(-1)3/4 ii) tan^(-1)2/11+tan^(-1)7/24=tan^(-1)1/2 iii) tan^(-1)1+tan^(-1)1/2+tan^(-1)1/3=pi/2 iv) 2tan^(-1)1/3+tan^(-1)/17=pi/4 v) tan^(-1)2-tan^(-1)1=tan^(-1)1/3 vi) tan^(-1)+tan^(-1)2+tan^(-1)3=pi vii) tan^(-1)1/2+tan^(-1)1/5+tan^(-1)1/8=pi/4 viii) tan^(-1)1/4+tan^(-1)2/9=1/2tan^(-1)4/3

If 3cot A=4 , check whether (1-tan^2A)/(1+tan^2A)=cos^2A-sin^2A or not.

If 3cot A=4 , check whether (1-tan^2A)/(1+tan^2A)=cos^2A-sin^2A or not.

If 3 cot A = 4, check whether (1 - tan^2 A) / (1 + tan^2 A) = cos^2 A - sin^2 A or not.