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![If f ( x ) = cos left[ pi ^ { 2 } right] x + cos left[ - pi ^ { 2 } right] x where. [ . ] stands the](https://search-static.byjusweb.com/question-images/toppr_ext/questions/1983248_1180018_ans_5d401a30a76a471092f1bd3d399a3b3d.jpg "If f ( x ) = cos left[ pi ^ { 2 } right] x + cos left[ - pi ^ { 2 } right] x where. [ . ] stands the")