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Using triangles to evaluate for the difference formula of tangent

Sure, here is the revised description with all the links and additional text removed: --- 👉 Learn how to evaluate the secant ...
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Higher – Calculations using the alternate segment theorem, tangents and chords

It is important to remember other angles rules, such as angles on a straight line add up to 180°, and to recognise angles in parallel lines. Make sure you are confident in applying Pythagoras’ theorem ...