document.write( "Question 1171118: If and sin∝=4/5, and ∝ is an acute angle, find the exact value of sin 2∝ \n" ); document.write( "

Algebra.Com's Answer #796019 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "If and sin(a)=4/5, and \"a\" is an acute angle, find the exact value of sin 2a.
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document.write( "If sin(a) = ,  then cos(a) =  =  =  =  = .\r\n" );
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document.write( "and we use the positive value of the square root, since the angle \"a\" is acute.\r\n" );
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document.write( "Next,  sin(2a) = one of the basic formula of Trigonometry = 2*sin(a)*cos(a) =  = .    ANSWER\r\n" );
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