document.write( "Question 1079977: Find the exact value using a sum or difference identity. Some simplifications may involve using symmetry and the formulas for negatives.
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Algebra.Com's Answer #694210 by ikleyn(52790) $\"\"$ $\"About$

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document.write( " = 75° = 45° + 30° =   =====>\r\n" );
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document.write( " =   =   ====>\r\n" );
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document.write( "    Use  = ,   = ,   = ,   =   ====>\r\n" );
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document.write( "=  =  = .\r\n" );
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