Trig Identities Flashcards
1
Q
how are Cos²θ and Sin²θ linked
A
Cos²θ = 1 - Sin²θ
2
Q
how are Cot²θ and Cosec²θ linked
A
Cot²θ = Cosec²θ - 1
3
Q
how are Tan²θ and Sec²θ linked
A
Tan²θ + 1 = Sec²θ
4
Q
what are other ways to write cos2x
A
- cos²x + sin²x
- 2cos²x -1
- 1-2sin²x
4
Q
what is another way to write sin2x
A
2sinxcosx
5
Q
what is another way to write tan2x
A
(2tanx)/1-tan²x
