$Q52)\int \frac{sinx+cosx}{cos^{2}xsin^{3}x-sin^{2}xcos^{3}x}dx$
$Q53)\int \frac{dx}{cos3x-cos^{3}x}$
$Q54)\int \frac{dx}{cos2x-sec^{2}x}$
$Q52)\int \frac{sinx+cosx}{cos^{2}xsin^{3}x-sin^{2}xcos^{3}x}dx$
$Q53)\int \frac{dx}{cos3x-cos^{3}x}$
$Q54)\int \frac{dx}{cos2x-sec^{2}x}$
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