Trig identities

Pythagorean identity (using sin and cos)

sin²(Θ)+cos²(Θ)=1
Pythagorean identity (using tan and sec)

1+ tan²(Θ) = sec²(Θ)

sec²(Θ)-tan²(Θ) = 1
Pythagorean identity (using cot and csc)

1 + cot²(Θ) = csc²(Θ)

csc²(Θ)-cot²(Θ) = 1
Tangent Identity
tanΘ=
- = sinΘ
- cosΘ
Cotangent Identity
cotΘ=
- = cosΘ
- sinΘ
sin(2Θ)=

=2sin(Θ)cos(Θ)
cos(2Θ)=
- =cos²(Θ)-sin²(Θ)
- =2cos²(Θ)-1
- =1-2sin²(Θ)
tan(2Θ)=

Author

saucyocelot

358578

Card Set

Trig identities

Description

Review of trigonometric identities

Updated

2023-10-06T14:09:19Z