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1 =
sin²x+cos²x
(identity) sec²x =
1 + tan²x
(identity) csc²x=
1 + cot²x
sin(2x)
= 2sin(x)cos(x)
cos(2x)
= cos²(x) - sin²(x)
tan(2x)
= (2tanx)/(1 - tan²x)
d/dx [tan(x)]
= sec²(x)
d/dx [csc(x)]
= -csc(x)cot(x)
d/dx [sec(x)]
= sec(x)tan(x)
d/dx [cot(x)]
= -csc2x
d/dx [ax]
= axln(a)
d/dx [logax]
= 1/(xln(a))
even function
f(x) = f(-x)
odd function
f(-x) = -f(x)
a function with an inverse
one-to-one OR horizontal line test
L(x) =
f(a) + f’(a)(x-a)