Question

write all the trigonometric identities

Answer 1

Odd/Even Identities

1. sin (-x) = -sin x
2. cos (-x) = cos x
3. tan (-x) = -tan x
4. csc (-x) = -csc x
5. sec (-x) = sec x
6. cot (-x) = -cot x


Cofunction Identity - radians


Cofunction Identities - degrees


Periodicity Identities - radians


Periodicity Identities - degrees


Sum/Difference Identities

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

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

Double Angle Identities

sin(2x) = 2 sin(x) cos(x),
cos(2x) = cos2(x) - sin2(x),
cos(2x) = 2 cos2(x) - 1,
cos(2x) = 1 - 2 sin2(x),
tan(2x) = [2 tan(x)]/[1-tan2(x)],.
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