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sin (0)
0
sin(π/2)
1
sin(π)
0
sin(3π/2)
-1
sin(1)
0
cos(0)
1
cos(π/2)
0
cos(π)
-1
cos(3π/2)
0
cos(1)
1
x^n
n even, n>0

x^n
n odd, n>0

x^n
n even, n<0

x^n
n odd, n<0

x^-n
n >0

π/6
(√3/2, 1/2)
π/4
(√2/2,√2/2)
π/3
(1/2, √3/2)