結果 : cos n pi theta formula
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Trick to learn trigonometry values || sin nπ |cosnπ | cos (nπ+ theta)| sin(nπ+ theta)| keto Classes

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If n is an integer , prove that ,`cos(npi+theta)=(-1)^ncostheta`

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(1+ i)^2n + (1-i)^2n = 2^n+1 Cos(n pi /2) ; De-Movire's theorem@EAG

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value of cos( n+1)π**####using the cos( A+B) formula######

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AST cos n pi

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