(tg x)' = 1/cos²x
(xⁿ)' = nx^n-1
∫(1/cos²x + 2•3x²)dx = tg x + 2x³ + C
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(tg x)' = 1/cos²x
(xⁿ)' = nx^n-1
∫(1/cos²x + 2•3x²)dx = tg x + 2x³ + C