Prove that
`tan alpha+2 tan 2 alpha+2^(2)tan^(2)alpha+..............+2^(n-1)tan2^(n-1)alpha+2^(@)cot2^(@)alpha=cotalpha`

Prove that: tan alpha +2tan 2alpha+ 2^(2)tan 2^(2)alpha +..... + 2^(n-1) tan 2^(n-1)alpha + 2^n cot 2^n alpha=cotalpha .

To find sum of tangents of a series of angles,the angles being in Arithmetical Progression To prove: Explian f his tan alpha+2tan2 alpha+2^(2)tan(2^(2)alpha)+2^(3)tan(2^(3)alpha)+......*2^(n-1)tan(2^(n-1)alpha)+2^(n)cot(2^(n)alpha)=cot alpha given all the functions are defined.

Prove: (2)/( cot alpha tan 2 alpha ) = 1 - tan ^(2) alpha.

The value of tan alpha+2tan(2 alpha)+4tan(4 alpha)+...+2^(n-1)tan(2^(n-1)alpha)+2^(n)cot(2^(n)alpha) is

The value of tanalpha+2tan(2alpha)+4tan(4alpha)+...+2^(n-1)tan(2^(n-1)alpha)+2^(n)cot(2^(n)alpha) is

Prove that cot alpha - tan alpha =2 cot 2 alpha.

The value of tan alpha +2tan(2alpha)+4tan(4alpha)+...+2^(n-1)tan(2^(n-1)alpha)+2^ncot(2^nalpha) is

Prove that sin 4alpha = 4 tan alpha (1 - tan^(2) alpha)/((1 + tan^(2) alpha)^(2))

Prove that sin4 alpha=4tan alpha (1- tan^(2)alpha)/((1+tan^2 alpha)^2