document.write( "Question 1117096: Given that tan A=1/5. Find the values of tan 2A, tan 4A and tan (45°-4A).
\n" ); document.write( "I have calculated the value of tan 2A by using tan 2A = 2tan A/1-tan^2A and the answer I have got is 5/12. Now I don't know how to solve further. Please give me a idea for it. \n" ); document.write( "

Algebra.Com's Answer #732070 by ikleyn(52835) $\"\"$ $\"About$

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document.write( "1.  tan(2A) =  =  =  =  =  = .\r\n" );
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document.write( "    So, your calculations for tan(2A) are correct.\r\n" );
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document.write( "2.  To calculate  tan(4A),  notice that  4A = 2*(2A);  thus  tan(4A) = tan(2*(2A)).\r\n" );
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document.write( "    So, you can repeat THE SAME PROCEDURE  to get  tan(4A)  starting from  tan(2A), which you just know.\r\n" );
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document.write( "3.  tan(45°-4A) =  = .\r\n" );
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document.write( "    So, when you will find  tan(4A)  (as I described in n.2), you will be in position to find  tan(45°-4A).\r\n" );
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