1.3 Flashcards
0
Q
angle addition formulas
A
sin(A+B)=sinAcosB+sinBcosA
cos(A+B)=cosAcosB-sinAsinB
1
Q
Pythagorean identities
A
cos^2θ + sin^2θ = 1
1 + tan^2θ = sec^2θ
1 + cot^2θ = csc^2θ
2
Q
double angle formulas
A
cos2θ = cos^2θ - sin^2θ sin2θ = 2sinθcosθ
3
Q
half angle formulas
A
sin^2θ = (1 - cos 2θ)/2 cos^2θ = (1 + cos 2θ)/2
4
Q
law of cosines
A
c^2 = a^2 + b^2 - 2ab cosθ
5
Q
law of sines
A
(sinA)/a = (sinB)/b = (sinC)/c
