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Trigonometry - Easy method to learn and memorize identities

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I need to know the trigonometric functions and trigonometric identities.

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An easy method to recall trigonometric identities is described with some interesting explanations. View the MS word attachment for clear text.

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The primary use of trigonometric functions is in the measurement of angles. The trigonometric functions can be easily understood as follows. See the figure below.

Now, we can write Sin (Φ) = y/r and its ...

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