document.write( "Question 1032544: If ∠A is ACUTE and cos A = 4/5 find sin A, cos2A, sin2A, tan2A \n" ); document.write( "

Algebra.Com's Answer #647214 by ikleyn(52782) $\"\"$ $\"About$

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\n" ); document.write( "If ∠A is ACUTE and cos A = 4/5 find sin A, cos 2A, sin 2A, and tan 2A
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document.write( "1.  sin(A) =  =  =  =  =  = +  = .\r\n" );
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document.write( "    Notice that the sign is \"+\" for sine, because ∠A is ACUTE.\r\n" );
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document.write( "2.  cos(2A) =  =  -  =  = .\r\n" );
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document.write( "3.  sin(2A) = 2*sin(A)*cos(A) =  = .\r\n" );
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document.write( "4.  tan(2A) =  =  =  = .\r\n" );
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