document.write( "Question 1096622: If cos(x) = a then does cos(-x) = -a ?
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Algebra.Com's Answer #711046 by ikleyn(52866) $\"\"$ $\"About$

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document.write( "If cos(x) = a then does cos(-x) = -a ?    - No.\r\n" );
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document.write( "If sin(x) = a then does sin(-x) = -a ?    - Yes.\r\n" );
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document.write( "If tan(x) = a then does tan(-x) = -a?     - Yes.\r\n" );
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