`(cos(pi/12)-sin(pi/12))(tanpi/12 + cotpi/12)`

(cos(pi/12)-sin(pi/12))(tan(pi/12)+cot(pi/12))=

Prove that cos(pi/12)+cos(3pi/12)+cos(9pi/12)+cos(11pi/12)=0

((1+cos(pi/(12))+i sin ((pi)/(12)))/(1+cos (pi/(12))- i sin (pi/(12))))^(72) is equal to

Prove that: 15sin(5pi)/(12)+15cos(5pi)/(12)-20sin^3(5pi)/(12)-20cos(5pi)/(12)=0

Using application of trignometric formulas prove that (i)cos(pi/4+x)+cos(pi/4-x)=sqrt2cos x(i1)sin(7pi/12)cos(pi/4)-cos(7pi/12)sin(pi/4)

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

(sin((5pi)/12)-cos((5pi)/12))/(cos((5pi)/12)+sin((5pi)/12))=

cos(pi/12)+sin^2((3pi)/12)+sin^2((9pi)/12)+cos((11pi)/12)=...

(cos ((pi) / (12)) - sin ((pi) / (12))) (tan ((pi) / (12)) + cot ((pi) / (12))) =