document.write( "Question 1105164: Use a cofunction identity to write an equivalent expression.\r
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Algebra.Com's Answer #719911 by ikleyn(52817) $\"\"$ $\"About$

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document.write( "cos(a) = sin(90°-a)  ====>\r\n" );
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document.write( "cos(20°) = sin(90°-20°) = sin(70°).\r\n" );
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