Find the value of tan `(13pi)/(12)`.

Find the value of tan pi/8 .

Find the value of (a) sin(pi)/(10)+sin(13pi)/(10) (b) cos^(2)48^(@)=sin^(2) 12^(@)

Find the value of tan. pi/20tan. (3pi)/20tan. (5pi)/20tan. (7pi)/20tan. (9pi)/20 .

Find the value of tan^(-1)(tan((3pi)/4))

Find the value of tan^(-1)(tan'(2pi)/(3)) .

Find the value of tan^(-1)(tan((3pi)/4))

Find the value of cos""(pi)/(12)(sin""(5pi)/(12)+cos""(pi)/(4))+sin""(pi)/(12)(cos""(5pi)/(12)-sin""(pi)/(4)) .

Find the value of (a) sin(pi)/(8) (b) cos(pi)/(8) (c) tan (pi)/(8)

Find the value of tan^(-1)((x-2)/(x-1))+tan^(-1)((x+2)/(x+1))=pi/4

Find the value of tan^(-1) (-tan.(13pi)/(8)) + cot^(-1) (-cot((9pi)/(8)))