Trig

Question 1

Graph identities

Answer 1

sinθ = sin(180-θ)
sinθ = -sin(180+θ)
sinθ = -sin(360-θ)

cosθ = -cos(180-θ)
cosθ = -cos(180+θ)
cosθ = cos(360-θ)

tanθ = tan(180+θ)
tanθ = -tan(180-θ)
tanθ = -tan(360-θ)

Question 2

sin^2(θ)/cos^2(θ)

Answer 2

= (sinθ/cosθ)^2
= tan^2(θ)