Enrich · Mathematics Advanced 11–12 – Year 11 · Trigonometry and measure of angles

Enrich Develop the definitions cos⁡θ = x/r, sin⁡θ = y/r and tan⁡θ = y/x, where (x,y) is a point on the circle of radius r, centred at the origin, and θ is the angle between the positive x -axis and the radius drawn to this point

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