If (1+x)^{n} = a_0+a_1x+a_2x^2 + ... + a_nx^n and a_0-a_2+a_4-a_6 + ... = k cos {n\pi}/4 , then k =

AP EAMCET Engineering 20 Apr 2019 Shift 2 Paper

Section: Mathematics

Question : 10 of 160

Marks: +1, -0

If (1+x)n = a0+a1x+a2x2 + ... + anxn and a0−a2+a4−a6 + ... = k cos

nπ

, then k =

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