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Tan(x)
Sin(x)/Cos(x)
Cot(x)
cos(x)/sin(x)
csc(x)
1/sin(x)
sec(x)
1/cos(x)
sin²(x)+cos²(x)
=1
tan²(x)+1
=sec²(x)
1+cos²(x)
=csc²(x)
sin(-x)
=-sin(x)
cos(-x)
=cos(x)
tan(-x)
-tan(x)
sin(2x)
=2sin(x)cos(x)
cos(2x)
=cos²(x)-sin²(x) = 2cos²(x)-1 = 1-sin²(x)
tan(2x)
=2tan(x)/1-tan²(x)
sin²(x)
=1/2(1-cos(2x))
cos²(x)
=1/2(1+cos(2x))
tan²(x)
= 1-cos(2x)/1+cos(2x)
sin(a)sin(b)
=1/2(cos(a-b)-cos(a+b))
cos(a)cos(b)
=1/2(cos(a-b)+cos(a+b))
sin(a)cos(b)
=1/2(sin(a+b)+sin(a-b))
law of sines
sinA/a=sinB/b=sinC/c
law of cosines
c²=a²+b²-2abcosC
d/dx(sinx)
cosx
d/dx(cosx)
-sinx
d/dx(tanx)
sec²x
d/dx(secx)
secxtanx
d/dx(cscx)
-cscxcotx
d/dx(cotx)
-csc²x