If $\sin\theta=0$sinθ=0, find $\theta$θ in degrees.
If $\cos\theta=0$cosθ=0, find $\theta$θ in degrees.
If $\sin\theta=1$sinθ=1, find $\theta$θ in degrees.
If $\cos\theta=1$cosθ=1, find $\theta$θ in degrees.
Use similarity to investigate the constancy of the sine, cosine and tangent ratios for a given angle in right-angled triangles.
Apply trigonometry to solve right-angled triangle problems.