Trig Double Angle Identities Flashcards
1
Q
sin2θ
A
2sinθcosθ
2
Q
cos2θ
A
cos²θ - sin²θ
2cos²θ - 1
1 - 2sin²θ
3
Q
tan2θ
A
(2tanθ)/(1 - tan²θ)
4
Q
Law of Cosines
A
c² = a² + b² - 2ab * cosC
a² = b² + c² - 2bc * cosA
b² = a² + c² - 2ac * cosB
5
Q
Law of Sines
A
sinA/a = sinB/b = sinC/c