Math trigonometric questions?
1)Determine tan2θ if sinθ + cosθ = -1
2) Express sin2θ in terms of csc θ and sec θ
3) Express cos3θ in terms of sin θ
Hello crosser43Square both sides:
Now use the identities and :
2) Express sin2θ in terms of csc θ and sec θ
See line 40 of Multiple-Angle Formulas -- from Wolfram MathWorld, and put3) Express cos3θ in terms of sin θ
Grandad