Math, asked by veenitkumar4, 1 year ago

plz solve this question​

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Answered by vishalkumar2806
1

formula \: used \\ cos \: 2x = \frac{1 - tan {}^{2}x }{1 + tan {}^{2} x} \\ - 2sinxsiny = cos(x + y) - cos(x - y) \\ 2cosxcosy = cos(x + y) + cos(x - y) =

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