Tính tích phân \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqaMPevLHfij5gC1rhimfMBNvxyNvga7LupCLMB0X % fBP1wA0n3x7btFEThxMjxyJThxWLgi9Thn913E7Thx0fMBG0Nx7jtF % 91hEKHxFamXvP5wqSXMqHnxAJn0BKvguHDwzZbqefqvATv2CG4uz3b % IuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfga % saacH8YjY-vipgYlh9vqqj-hEeeu0xXdbba9frFj0-OqFfea0dXdd9 % vqai-hGuQ8kuc9pgc9q8qqaq-dir-f0-yqaiVgFr0xfr-xfr-xb9ad % baqaaeGaciGaaiaabeqaamaabaabaaGcbaaeaaaaaaaaa8qacaWGjb % Gaeyypa0Zaa8qCa8aabaWdbiGacshacaGGHbGaaiOBa8aadaahaaWc % beqaa8qacaaIYaaaaaWdaeaapeGaaGimaaWdaeaapeWaaSaaa8aaba % Wdbiabec8aWbWdaeaapeGaaGinaaaaa0Gaey4kIipakiaadIhacaqG % KbGaamiEaaaa!61F8! I = \int\limits_0^{\frac{\pi }{4}} {{{\tan }^2}} x{\rm{d}}x\)

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