Question

questions 4 and 5..
class 11
kc sinha

Answer 1

make three separate series
${x}^{2} + {x}^{4} + {x}^{6} .......$
+
${x}^{ - 2} + {x}^{ - 4} + ...$

+
(2+5+8)

first and second will be of G.P. while third one will be of A.P.
solve it separate and then simplify altogether.