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Question

f(x)=x3sec(2x+1)tanx find f(x).

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Solution

Given
f(x)=x3sec(2x+1)tanx
f(x)=tanx[(3x2sec(2x+1)+x3.2sec2x+1)tan(2x+1)]x2sec(2x+1)sec2xtan2x

1086514_1183650_ans_40428cb060904518afe58106d952cd22.png

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