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d/dx(tan(x))
sec²(x)
d/dx(cot(x))
-csc²(x)
d/dx(sec(x))
sec(x)tan(x)
d/dx(csc(x))
-csc(x)cot(x)
sin²(x) + cos²(x) =
1
1 + tan²(x) =
sec²(x)
1 + cot²(x) =
csc²(x)
sin(2x) =
2sin(x)cos(x)
cos(2x) =
cos²(x) - sin²(x)
1 - 2sin²(x)
2cos²(x) - 1
sin²(x) =
1/2[1 - cos(2x)]
cos²(x) =
1/2[1 + cos(2x)]
x = asinθ
x = atanθ
x = asecθ