21●[2; 3]
21●[0; 1) | √2–√x>1 |
21●[0; 1] |õ² ∫ õ 1dt≤0
21●–π/2+2πn n*Z
21●–π/2+2πn,êεz
21●(π/3+2πn; 5π/6+2πn),(–π/3+2πn; π/6+2πn),n*Z
| x–y=–π/2 cosx+siny=1 |
21●–π/4+πn n*Z
21●5π/2+2πê,ê*z
21●1/x(x2+1)3
21●(x+1)2ex |ó=(õ²+1)åõ|
21●(x²+2x+1)e
21●(x+y)/(x–y) | (x/y–y/x)•(x/y+y/x–2)–1|
21●x²-x+C
21●π/2+πn, n+2πn, n*Z
21●π/2+πn, π+2πn, n*Z |sin²x=cosx+1|