document.write( "Question 921956: sin 3π/5 x cos 7π/30 + cos 3π/5 x sin 7π/30 = ?
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Algebra.Com's Answer #559300 by srinivas.g(540)\"\" \"About 
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RUle:
\n" ); document.write( " SIn A *cos B + cos A*Sin B = Sin( A+B)
\n" ); document.write( " so sin 3π/5 x cos 7π/30 + cos 3π/5 x sin 7π/30 = sin(3π/5+7π/30)\r
\n" ); document.write( "\n" ); document.write( "we need to simply the expression in the brackets i.e 3π/5+7π/30
\n" ); document.write( " multiply and divide with 30
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\n" ); document.write( "(3π/5) *(30/30) + (7π/30)* (30/30)
\n" ); document.write( " = (3π/1)*(6/30)+(7π/30)*(1/1)
\n" ); document.write( " = 3*6π/30 +7π/30
\n" ); document.write( " = 18π/30 +7π/30
\n" ); document.write( " = (18π+7π)/30
\n" ); document.write( " =25π/30
\n" ); document.write( "so sin( 25π/30) = \"-1%2Fsqrt%282%29\" \n" ); document.write( "
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