(iv)pi R(R+5)(R-5)

If f:F rarr R is defind by f(x)=7+cos(5x+3),AA x in R then period of f is (A)2 pi(B)pi(C)(pi)/(5) (D) 2(pi)/(5)

Find 'r' if : (i) ""^(5)P_(r )= ""^(6)P_(r-1) (ii) 5""^(4)P_(r )=6""^(5)P_(r-1) (iii) ""^(5)P_(r )=2""^(6)P_(r-1) (iv) ""^(10)P_(r+1): ""^(11)P_(r )=30 :11 .

Find r if (i) .^(5)P_(r) = 2 .^(6)P_(r-1) (ii) .^(5)P_(r) =^(6)P_(r-1) .

Fine r if (i) ""^(5) P_(r) =2 ""^(6)P_(r-1) (ii) ""^(5) P_(r) = ""^(6)P_(r-1)

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

If (r+1)^(th) term is (3.5...(2r-1))/(r!) (1/5)^(r) , then this is the term of binomial expansion-

If quad cos((2r pi)/(5))+i sin((2r pi)/(5)),r=0,1,2,3,4 then z_(1)z_(2)z_(3)z_(4)z_(5) is equal to ,r=0,1,2,3,4