Trig Identities

1

sec^2(x)

csc^2(x)

sin(x)/cos(x)

cos(x)/sin(x)

-sin(x)

cos(x)

-tan(x)

-csc(x)

sec(x)

-cot(x)

1/sin(x)

1/cos(x)

1/tan(x)

1/csc(x)

1/sec(x)

1/cot(x)

cos (pi/2-x)

sin (pi/2-x)

cot (pi/2-x)

sec (pi/2-x)

csc (pi/2-x)

tan (pi/2-x)

cos(x)cos(y) +- sin(x)sin(y)

sin(x)sin(y)+-cos(x)cos(y)

tan(x)+-tan(y)/1+-tan(x)tan(y)

2sin(x)cos(x)

cos^2(x)-sin^2(x)

2cos^2(x)-1

1-2sin^2(x)

2tan(x)/1-tan^2(x)

1-cos2(x)/2

1+cos2(x)/2

1-cos2(x)/1+cos2(x)

+-(1-cos(x)/2)^1/2

+-(1+cos(x)/2)^1/2

+-(1-cos(x))^1/2

(1-cos(x)/sin(x))^1/2

sin (x)/1+cos(x)

sinB/b

sinC/c

1/2 absinC

b^2+c^2-2bc cosA

b^2+c^2-a^2/2bc

(s(s-a)(s-b)(s-c))^1/2