Find the value of `sin frac(19pi)(3)^c`

Find the value of cot frac(25pi)(3)^c

Find the values of: sin(pi/8)

Find the value of sin^-1(sin(frac{3pi}{5}))

Find the value of frac(cos56^@)(sin34^@)

In /_\ABC , if a=18 , b=24 , c=30 then find the value of: sin(frac{A}{2})

In /_\ABC , if a=13 , b=14 , c=15 then find the value of: sin(frac{A}{2})

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

Find the value of the : sin^2 pi/6 + cos^2 pi/3 - tan^2 pi/4

If 2sinx=1 , (pi/2) < x < pi and sqrt2 cosy=1, ((3pi)/2) < y < 2pi then find the value of (frac(tanx+tany)(cosx-cosy))

Find the value of the following: sin(cos^-1(frac{-1}{2}))