" Q95: If "C^(2)+S^(2)=1_(3)" then "(1+C+iS)/(1+C-iS)" is equal to "

If C^(2)+S^(2)=1 , then (1+C+iS)/(1+C-iS) is equal to

If C^(2)+S^(2)=1 , then (1+C+iS)/(1+C-iS) is equal to

If a+b+c=2,a^(2)+b^(2)+c^(2)=1 and abc=3 then (1)/(a)+(1)/(b)+(1)/(c) is equal to a.1/2 b.2 c.1 d.0

C_(0)-C_(1)+C_(2)-C_(3)+ . . .+(-1)^(n)C_(n) is equal to

The sum of the series 1+(1)/(2) ""^(n) C_1 + (1)/(3) ""^(n) C_(2) + ….+ (1)/(n+1) ""^(n) C_(n) is equal to

C_(0)-3C_(1)+5c_(3)+....+(-1)^(n)(2n+1)C_(n) is equal to