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cos²(x)+sin²(x)=
1
1+tan²(x)=
sec²(x)=
1+cot²(x)=
csc²(x)=
sin(a+b)=
sin(a)cos(b)+sin(b)cos(a)
cos(a+b)=
cos(a)cos(b)-sin(a)sin(b)=
sin(2x)=
2sin(x)cos(x)=
cos(2x)
cos²(x)-sin²(x)
sin²(x)=
(1-cos(2x))/2
cos²(x)=
(1+cos(2x))/2