Trigonometric Identities and other THREE trigonometric ratios

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You will be surprised by knowing how easy to remember all this trigonometric things.
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A series for O & A level Trigonometry. Learn without memorizing all three trigonometric identities and three more trigonometric ratios.
Easy Explanations.
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This stuff, is really really fun! trigonometry... just geometry in general is my favorite! Which is your favorite?!

FarizTGK