document.write( "Question 887545: given that cos2a =2/5 and 0<2a<90, determine the exact values of sin a, cos a, tan a, csc a, sec a, and cot a. \n" ); document.write( "

Algebra.Com's Answer #536718 by Edwin McCravy(20059) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( "Since a is in the first quadrant, everything will be positive, so\r\n" );
document.write( "when we take square roots we only need to take positive square\r\n" );
document.write( "roots.\r\n" );
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document.write( "Use the identity \r\n" );
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document.write( ", that's the cosine.\r\n" );
document.write( "You can rationalize the denominator if you like.\r\n" );
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document.write( "Then use the identity \r\n" );
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document.write( "Use the identity: \r\n" );
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document.write( ", that's the sine.\r\n" );
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document.write( "Then use the identity \r\n" );
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document.write( ", that's the cosecant.\r\n" );
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document.write( "Use the identity  \r\n" );
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document.write( ", that's the tangent\r\n" );
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document.write( "Use the identity  \r\n" );
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document.write( ", that's the cotangent.\r\n" );
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document.write( "So that's all six.\r\n" );
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document.write( "Edwin

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