Let `C=sum_(r=1)^17 cos (10r)^@ and S=sum_(r=1)^17 cot (10r)^@`, then

Let (1+x)^(10) = sum_(r=0)^(10) c_(r) x^ (r ) and (1+x)^(7) = sum_(r=0)^(7) d_(r) x^(r ) . If P= sum_(r=0)^(5) c_(2r) and Q= sum_(r=0)^(3) d_(2r+1), then (P)/(Q) is equal to

Let S= sum_(r=1)^(5) cos (2r-1) (pi)/(11) and P=Pi_(r=1)^(4) cos (2^(r). (pi)/(15)) , then

Let S= sum_(r=1)^(5) cos (2r-1) (pi)/(11) and P=Pi_(r=1)^(4) cos (2^(r). (pi)/(15)) , then

Let S= sum_(r=1)^(5) cos (2r-1) (pi)/(11) and P=Pi_(r=1)^(4) cos (2^(r). (pi)/(15)) , then

Let (1+x)^10= sum_(r=0)^(10)c_(r) x^(r), and (1+x)^(7)= sum_(r=o)^(7)d_(r)x^(r). If P= sum_(r=0)^5c_(2r) and Q= sum_(r=o)^(3) d_(2r+1) , then (p)/(Q) is equl to

sum_(r=1)^10 r/(1-3r^2+r^4)

Let (1 + x + x^(2))^(100)=sum_(r=0)^(200)a_(r)x^(r) and a=sum_(r=0)^(200)a_(r) , then value of sum_(r=1)^(200)(ra_(r))/(25a) is

Let (1 + x)^(10)=sum_(r=0)^(10)c_(r)x^(r) and (1+x)^(7)=sum_(r=0)^(7)d_(r),x^(r). If P=sum_(r=0)^(5)c_(2r) and Q=sum_(r=0)^(3)d_(2r+1) , then P/Q is equal to ______