document.write( "Question 1031121: sen(a)= 3/5, π/2 < a < π and cos (B)=20/29, 0 < B <π/2, sin (a-B)= ???? \n" ); document.write( "

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\n" ); document.write( "sen(a)= 3/5, π/2 < a < π and cos (B)=20/29, 0 < B <π/2, sin (a-B)= ????
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document.write( "Use the formula  sin(a - b) = sin(a)*cos(b) - cos(a)*sin(b).\r\n" );
document.write( "   (Regarding this formula, see the lesson Addition and subtraction formulas in this site.)\r\n" );
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document.write( "You need to know cos(a) and sin(b) in addition to the given sin(a) and cos(b).\r\n" );
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document.write( "Calculate\r\n" );
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document.write( "cos(a) = +/- . Choose correct sign before  sqrt  based on info about angle \"a\".\r\n" );
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document.write( "sin(b) = +/- . Choose correct sign before  sqrt  based on info about angle \"b\".\r\n" );
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document.write( "See the sample in the lesson Calculating trigonometric functions of angles>,  Problem 3.\r\n" );
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\n" ); document.write( "\n" ); document.write( "I was not able to read your original formula, and therefore corrected it by inserting the blank dividers.\r
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