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[" 27) Prove that "(sin8x cos x-sin6x co...

[" 27) Prove that "(sin8x cos x-sin6x cos3x)/(cos2x cos x-sin4x sin3x)=tan2x],[" 28) Find the number of "4" - digit numbers that can be formed using the digits "],[1,2,3,4,5" if no digit is repeated.How many of these will be even? "]

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