Equazioni elementari

sin(x)=l,
a=arcsin(l), 0£a £p /2
	[0,2p]		[-p,p]		In generale
	1^a sol	2^a sol	1^a sol	2^a sol	1^a sol	2^a sol
l<-1, l>1	n.s.		n.s.		n.s.
0£ l £1	a	p-a	-p+a	-a	a+2kp	(p-a)+2kp , k=0,±1..
-1£ l <0	p+a	2p-a	-p+a	-a	(p+a)+2kp	(2p-a)+2kp , k=0,±1..

cos(x)=l,
a=arcos(l), 0£a £p /2
	[0,2p]		[-p,p]		In generale
	1^a sol	2^a sol	1^a sol	2^a sol	1^a sol	2^a sol
l<-1, l>1	n.s.		n.s.		n.s.
0£ l £1	a	2p-a	a	-a	a+2kp	-a+2kp , k=0,±1..
-1£ l <0	p-a	p+a	p-a	-p+a	(p-a)+2kp	(p+a)+2kp , k=0,±1..

tan(x)=l,
a=arctan(l), 0£a £p /2,
	[0,p]		[p,2p]	[-p,0]	[0,p]		In generale
	1^a sol	2^a sol		1^a sol		2^a sol
l ³0	a	p+a		-p+a		a	a+kp , k=0,±1..
l <0	p-a	2p-a		-a		p-a	-a+kp , k=0,±1..