Find the value of `sin (pi/4) - cos (pi/4).`

Find the value of cos^4 (pi / 8)

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

Find the value of: 3sin(pi/6) sec(pi/3) 4sin((5pi)/6) cot(pi/4)

Find the value of 2cos((5pi)/12) cos(pi/12) and 2sin((5pi)/12)cos(pi/12)

let cos(pi/7),cos((3pi)/7),cos((5pi)/7), the roots of equation 8x^3 - 4x^2 - 4x +1=0 then the value of sin(pi/14),sin((3pi)/14),sin((5pi)/14)

Find the value of int _( 0) ^(pi//4) (sin x) ^(4) dx :

Find the value of int _( 0) ^(pi//4) (sin x) ^(4) dx :

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

Find the value of cos(2pi)/7+cos(4pi)/7+cos(6pi)/7

Find the value of cospi/7+cos(2pi)/7+cos(3pi)/7+cos(4pi)/7+cos(5pi)/7+cos(6pi)/+cos(7pi)/7