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| Summary |
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sine of an angle = cosine of its complement. If sin A = cos B, then A + B = 90o. |
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Trigonometric ratios of standard angles |
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| (i) sin 0o = 0, cos 0o = 1, tan 0o = 0 |
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(ii)  |
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(iii)  |
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(iv)  |
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(v) sin 90o = 1 cos 90o = 0 tan 90o =  |
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