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| Introduction |
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| Let us recapitulate the trigonometric ratios (t-ratios). There are six t-ratios. |
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| DABC is a right-angled triangle,
ÐB = 90o. |
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(i)  |
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In short,   |
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(ii)  |
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 In short,   |
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(iii) tangent A  |
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tangent A  In short, tan A   |
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| Similarly three more ratios can be obtained by taking the reciprocals of sine, cosine and tangent ratios. |
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(iv) cosecant  In short,  |
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(v) secant In short,  |
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(vi) cotangent In short,  |
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| From the above figure, we can obtain: |
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| sine A means sine of angle A. |
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 (i) sin A is not sine x A |
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(ii) sin A + sin B  sin (A + B) |
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(iii) sin A + cos A  (sin + cos) A |
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Trigonometrical Identities
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