document.write( "Question 1095006: Find sin2x, cos2x, and tan2x if cos=-2/sqrt 5
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Algebra.Com's Answer #709612 by ikleyn(52817)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "In order for the answer was UNIQUELY DEFINED, it should be pointed, to which quadrant the angle x does belong.\r
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\n" ); document.write( "\n" ); document.write( "Had you pointed it from the very beginning, you would got the answer quickly / quicker.\r
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