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The sum and difference formulas help us evaluate the value of trigonometric functions at angles that can be expressed as the sum or difference of specific angles. In this guide, you will learn more about the sum and difference formulas.
The Pythagorean theorem can be applied to the trigonometric ratios that give rise to the Pythagorean identity. In this step-by-step guide, you will learn the concept of Pythagorean identity.
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