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[" 7."(cos12^(@)-sin12^(@))/(cos12^(@)+s...

[" 7."(cos12^(@)-sin12^(@))/(cos12^(@)+sin12^(@))+(sin147^(@))/(cos147^(@))" का मान क्या होगा? "],[[" (a) "1," (b) "-1],[" (c) "0," (d) इनमें से कोई नहीं "]]

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