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

Enrich Use the definitions cos⁡θ = x/r, sin⁡θ = y/r and tan⁡θ = y/x to evaluate sin⁡θ, cos⁡θ and tan⁡θ where θ is a multiple of 90°, and identify the values of θ for which these ratios are undefined

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