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posted by lan on Sunday, May 8, 2011 at 4:06pm.
A right triangle has sides of length 5, 12 and 13. What is the sine of the angle opposite the hypotenuse? (A) 1 (B) 5/12 (C) 5/13 (D) 12/13 (E) None of the above.
Mmmmh, aren't they asking for sin 90° ?
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