`sin((5pi)/18)-cos((4pi)/9)=sqrt(3)sin(pi/9)`

Prove that: i) sin(5pi)/(18) - cos(4pi)/(9) = sqrt(3)sinpi/9 ii) cos(3pi)/4+A-cos((3pi)/(4)-A)=-sqrt(2)sinA

Prove that: i) sin(5pi)/(18) - cos(4pi)/(9) = sqrt(3)sinpi/9 ii) cos(3pi)/4+A-cos((3pi)/(4)-A)=-sqrt(2)sinA

The value of sin((pi)/(18))+sin((pi)/(9))+sin((2pi)/(9))+sin((5pi)/(18)) is

Prove that: sin((4 pi)/(9)+7)cos((pi)/(9)+7)-cos((4 pi)/(9)+7)sin((pi)/(9)+7)=(sqrt(3))/(2)

The value of sin (pi/18)+sin ((pi)/(9))+sin (2 pi/9)+sin (5 pi/18) is given by

If k=sin((pi)/(18))sin((5pi)/(18))sin((7pi)/(18)) , then the numerical value of k is ………..

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

Prove that: sin((4pi)/9+7)cos(pi/9+7)-cos((4pi)/9+7)sin("pi/9+7)=(sqrt(3))/2