2+x-'-2 cos (D) x"+x-^= ? (a) & 268...
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2+x-'-2 cos (D) x"+x-^= ? (a) & 268 (pp) (B) Lesin (np) co) cos (np) (d) sin (np)

JEE/Engineering Exams
Maths
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( x+x^{-1}=2 cos (p) ) ( x^{n}+bar{x}^{n}=? ) This noblem can be solud by subshuhor ( I=n=1, x^{prime}+x^{-1}=2 cos (p) ) ( 2 cos (n p) Rightarrow 2 cos p ) b) ( 2 sin (n p) Rightarrow 2 sin p ) C) ( cos (n p) ) a corp ( d{ }_{1} sin (n p) rightarrow s_{1} dot{n} p ) ( therefore 2 cos (n p) ) in the answee
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