document.write( "Question 1141918: Use your calculator to find arcsin (sin (150 degrees) ). Why didn’t the calculator say 150 degrees? \n" ); document.write( "
Algebra.Com's Answer #762560 by ikleyn(52806)\"\" \"About 
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document.write( "sin(150°) = \"1%2F2\" = sin(30°).\r\n" );
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document.write( "arcsin(x) is always between  \"-pi%2F2\" and  \"pi%2F2\"  (BY THE DEFINITION).\r\n" );
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document.write( "Therefore,  arcsin(sin(150°) ) = \"arcsin%281%2F2%29\" = 30°.\r\n" );
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document.write( "The calculator is SO SMART that it knows it (the calculator is programmed in this way !), so it knows the correct answer.\r\n" );
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