Thus, the values of cos θ and sin θ will sometimes be positive and sometimes negative depending on the value of θ. The graphs of y = sin θ and y = cos θ can be plotted.

GCSE OCR Trigonometry - OCR Trigonometric graphs - Higher The three trigonometric ratios; sine, cosine and tangent are used to calculate angles and lengths in right-angled triangles. The sine and ...