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These are also known as the addition and subtraction theorems or formulae . The identities can be derived by combining right triangles ... -
In trigonometry, the basic relationship between the sine and the cosine is known as the Pythagorean identity: {\displaystyle \sin ^{2}\... -
By examining the unit circle, the following properties of the trigonometric functions can be established. Symmetry When the trigon...
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