If `sum_(r=15)^29cos((rpi)/2+theta)=S_1` and `sum_(r=15)^29sin((rpi)/2+theta)=S_2` then find the value of `s_2/s_1`

If sum_(r=15)^29(cos(rpi/2+theta)=S_1 and sum_(r=15)^29(sin(rpi/2+theta)=S_2 , then S_1/S_2 equals

If sum_(r=15)^(29)(cos(r(pi)/(2)+theta)=S_(1) and sum_(r=15)^(29)(sin(r(pi)/(2)+theta)=S_(2), then (S_(1))/(S_(2)) equals

If S_n=cos^n theta+sin^n theta then find the value of 3S_4-2S_6

If S_n=cos^n theta+sin^n theta then find the value of 3S_4-2S_6

If S_n=cos^ntheta+sin^n theta then find teh value of 3S_4-2S_6

Find sum_(r=1)^(10) cos^(3) rpi/3 .

Find the value of sum_(r=1)^(n-1)"sin"^(2)(rpi)/(n)

sum_(r=0)^(n) sin^(2)""(rpi)/(n) is equal to

Let f(theta)=(1)/(1+(cot theta)^(x)), and S=sum_(theta=1)^(89)f(theta) then the value of sqrt(2S-8) is