Find the value of `tan13pi^c/12`

Find the values of: tan105^@

Find the values of: tan225^@

Find the value of tan^-1(1/2tan2A)+tan^-1(cotA)+tan^-1(cot^3A)

Find the value of tan^-1(tan(frac{pi}{6}))

If cos(alpha+beta)=4/5; sin(alpha-beta)=5/13 and alpha,beta lie between 0&pi/4 then find the value of tan2alpha

Find the values of: tan(-690^@)