IPE MATHS IIA MODELPAPER1 Q18|If n is a positive Integer show that (1+cosθ+isinθ)^n+(1+cosθ–isinθ)^n

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If n is a positive Integer then show that (1+cosθ +isinθ)^n + (1+cosθ – isinθ)^n = 2^(n+1)cos^n(θ/2)cos(nθ/2)
IPE MATHS IIA MODEL PAPER 1 QNO 18

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