Question

1). S(3/cos^2X-1/x^2-4)dx= 2). S 3dx/9+x^2=

Answer 1

$1)quad int (frac{3}{cos^2x}-frac{1}{x^2}-4)dx=3cdot tgx+frac{1}{x}-4x+C\\2)quad int frac{3, dx}{9+x^2} = 3cdot frac{1}{3}arctgfrac{x}{3} +C=arctg frac{x}{3} +C$