If `1+^n C_1costheta+^n C_2cos2theta+........ +^n C_n` equals

1+^n C_1costheta+^n C_2cos2theta+........ +^n C_ncosntheta equals

If 1+^(n)C_(1)cos theta+^(n)C_(2)cos2 theta+.......+^(n)C_(n) equals

1+.^(n)C_(1)costheta+.^(n)C_(2)cos2theta+...+.^(n)C_(n)cosntheta equals

If (2^n+1)theta=pi then 2^n costheta cos2theta cos2^2 theta .......cos 2^(n-1) theta=

If n=5 ,then ("^n C_0)^(2) + ("^n C_1)^(2) + ("^n C_2)^(2) +......+ ("^n C_5)^(2) is equal to

If theta =(pi)/(2 ^(n) +1), then cos theta cos 2 theta cos 2^(2) theta …cos 2 ^(n-1)theta is equal to ................... A) (1)/(2 ^(n)) B) cos theta C) 2 D) 2^(n)

If sintheta +cos theta =m and sec theta + cosec theta =n then n(m+1)(m-1) equals................ A) m B) n C) 2m D) 2n

If z + (1)/(z) = 2 cos theta, z in "C then z"^(2n) - 2z^(n) cos (n theta) is equal to

""^n C_0- ^n C_1 + ^n C_2.....(-1)^n ""^n C_n=

[(. ^nC_0+^n C_3+)-1/2(.^n C_1+^n C_2+^n C_4+^n C_5]^2 + 3/4(.^n C_1-^n C_2+^n C_4 +)^2= equals to a. 3 b. 4 c. 2 d. 1