Evaluate `Delta tan^-1 x`.

Evaluate Delta^2 log x.

Evaluate int tan (-x) dx.

Evaluate tan^(-1)3 +tan^(-1)4 -tan^(-1)(-(7)/(11)) .

Evaluate tan1° tan 45° tan 89° .

Evaluate : tan(sin^-1frac{1}{3})

Evaluate : cos(tan^-1frac{3}{4})

Find the value of tan(2"tan"^(-1) (1)/(5)) .

Evaluate: (frac(Delta^2)(E))x^3

If x+y=0 , evaluate tan^-1frac{a_1x-y}{a_1y+x}+tan^-1frac{a_2-a_1}{a_1a_2+1}+tan^-1frac{a_3-a_2}{a_2a_3+1}+...+tan^-1frac{a_n-a_(n-1)}{a_(n-1)a_n+1}+tan^-1frac{1}{a_n}

If f(x)=logx,find the value of Delta logx.