FORMULARIO
FORMULARIO
TRIGONOMETRIA
sin2 x + cos2 x = 1;
tan x =
sin x
cos x ;
coth x =
cos x
sin x
sin(?x) = ? sin x; cos(?x) = cos x; sin( 2 x) = cos x; cos( 2 x) = ? sin x;
sin( x) = ? sin x; cos( x) = ? cos x; sin(x + 2) = sin x; cos(x + 2) = cos x;
sin(x y) = sin x cos y cos x sin y;
cos(x y) = cos x cos y ? sin x sin y
sin(2x) = 2 sin x cos x; cos(2x) = cos2 x ? sin2 x = 2 cos2 x ? 1 = 1 ? 2 sin2 x
cos2 x = 1+cos(2x)
; sin2 x = 1?cos(2x)
2
2
u?v
sin u + sin v = 2 sin u+v
2 cos 2 ;
u+v
u?v
cos u ? cos v = ?2 sin 2 sin 2 ;
u?v
sin u ? sin v = 2 cos u+v
2 sin 2 ;
sin x cos y = 12 [sin(x + y) + sin(x ? y)];
sin x sin y = ? 21 [cos(x + y) ? cos(x ? y)]
Posto t = tan(x/2), si ha:
sin x =
cos x cos y = 12 [cos(x + y) + cos(x ? y)];
2t
1+t2 ;
1?t2
1+t2 ;
cos x =
cos 6 = 23 ;
sin 0 = 0
cos 0 = 1
sin 6 = 12 ;
sin 3 = 12 ;
sin 2 = 1;
cos 2 = 0;
sin 3 = 23 ;
DISUGUAGLIANZE
|sin x| |x| per ogni x R;
SVILUPPI DI MACLAURIN
3
2
ex = 1 + x + x2! + x3! + +
log(1 + x) = x ?
x2
2
+
x3
3
x2
2
0 1 ? cos x
log(1 + x) x per ogni x > ?1;
xn
n!
|xy|
x2 +y 2
;
2
(x+y)2
2
2
2 ;
cos 4 =
n
x5
5!
x
+ + (?1)n (2n+1)!
+ o(x2n+2 )
2n+1
cos x = 1 ?
x2
2!
+
x4
4!
+ + (?1)n x2n! + o(x2n+1 )
2n
2 5
15 x
+
(1 + x) = 1 + x +
x5
5
+ o(x6 )
2n+1
+ + (?1)n x2n+1 + o(x2n+2 )
(?1) 2
x
2!
+
(?1)(?2)) 3
x
3!
+ +
1
2
2 ;
x2 + y 2 ; x4 + y 4 (x2 + y 2 )2
+ + (?1)n+1 xn + o(xn )
+
x3
3
sin 4 =
2t
1?t2 ;
+ o(xn )
x3
3!
arctan x = x ?
tan x =
per ogni x R;
sin x = x ?
tan x = x + 13 x3 +
u?v
cos u + cos v = 2 cos u+v
2 cos 2 ;
(?1)(?n+1) n
x
n!
+ o(xn )
................
................
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