Question

интеграл 5dx/cos^2x ​

Answer 1

$intlimits^{frac{pi}{4}}_{0} {frac{5dx}{cos^2{x}} = 5intlimits^{frac{pi}{4}}_{0} {frac{dx}{cos^2{x}}  = 5 (tan {frac{pi}{4}- 0)=5(1-0)=5$

Answer 2

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