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| from: category_eng |
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| sink=x and cosk=2x cosk=2sink. therefore, 1/2=tank. | |
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| 8. e |
Understanding |
| 9. b | |
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| 10. a | |
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| 11. e |
Understanding |
| sin^2 x + cos^2 x =1. Can u see it? | |