chapter - 4 - trigonometric functions

chapter - 4 - trigonometric functions - Ex: 4.1

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chapter - 4 - trigonometric functions - Ex: 4.2

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chapter - 4 - trigonometric functions - Ex: 4.3

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chapter - 4 - trigonometric functions - Ex: 4.4

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chapter - 4 - trigonometric functions - Ex: 4.5

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