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Webwe can find approximations of the trigonometric functions for small angles measured in radians by considering their graphs near input values of 𝑥 = 0. Let’s start with 𝑦 = 𝑥 s i n and compare it to line 𝑦 = 𝑥. When the angle θ (in radians) is small we can use these approximations for sine, cosine and tangent: Sin θ ≈ θ. Cos θ ≈ 1 − θ2 2. Tan θ ≈ θ. If we are very daring we can use cos θ ≈ 1. Webrevision notes on 5. 4. 3 small angle approximations for the edexcel a level maths: Pure syllabus, written by the maths experts at save my exams. Webwhen the angle is small, the approximation reads $\sin \theta \approx \theta$, you can try this simulation below to verify the relation. Click try it to display the value of each element in the form. The angles are in radians, so :2 = :2 radians 11:4. (multiply by 180= to convert from radians to degrees, and by =180 to convert from degrees to radians. ) continuity of sin x at x = 0 tells us sin x ! Sin 0 = 0 as x !