Prove that `{(1-cot^2((a-pi)/4))/(1+cot^2((a-pi)/4))+cos(a/2)*cot4a}sec((9pi)/2)=cosec4alpha`.

Prove taht {(1-cot^(2)((alpha-pi)/(4)))/(1+cot^(2)((alpha-pi)/(4)))+cos((alpha)/(2))cot(4 alpha)}sec((9 alpha)/(2))=cos ec4 alpha

Prove that cot((pi)/(4) + 0) cot ((pi)/(4) - 0) =1 .

Prove that cot((pi)/(4)-2cot^(-1)3)=7

Prove that : cot(pi/4-2cot^(-1)3)=7

Prove that cot(pi/4-2cot^(- 1)3)=7

Prove that cot(pi/4-2cot^(- 1)3)=7

cot((pi)/(4)-2cot^(-1)3)

Prove that 2cot^(-1)5+ cot^(-1)7 + 2cot^(-1)8 =pi/4

4-cot((pi)/(4)+theta)cot((pi)/(4)-theta)=1

cot((pi)/4-2cot^(-1)3)=