Question

I only need a little guidance on this, please.

Answer 1

sinØ=-1

cosØ

• √1-sin²Ø
• √1-1
• 0

tanØ

• sinØ/cosØ
• 1/0
• undefined

Answer 2

Use the following identities:

• sin²θ + cos²θ = 1

Since sinθ = -1

• cos²θ = 1 - sin²θ
• cosθ = √1 - sin²θ = √1 - (-1)² = √0 = 0

Tangent:

• tanθ = sinθ / cosθ
• tanθ = -1 / 0 = undefined in any interval where sinθ = -1