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Answers and Explanations'); parent.frames[0].document.write('

The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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'); resetdisplay(); for(var i = 0; i <5; i++) { ganswer[i] = prompt(question[i],""); if (ganswer[i] == "quit" || ganswer[i] == "QUIT" || ganswer[i] == "Quit") { break; } q++; if (ganswer[i] == answer[i]) { c++; } else { rightans[i] = 0; w++; } resetdisplay(); } for(var i = 0; i < 10; i++) { if (rightans[i] == 0) { expl = expl + explain[i]; } } parent.frames[0].document.write(expl); parent.frames[0].document.write(""); } question[0] = 'True or False: Identities replace sin or cos with constants.'; question[1] = 'True or False: You always use identities when doing any trig problem.'; question[2] = 'True or False: sin(x) = cos(x-30 degrees)'; question[3] = 'True or False: You can use identities to find exact values for specific angles such as tan(15) (in degrees)'; question[4] = 'True or False: You can use identities to find exact values for any angle you wih such as tan (1) (in degrees)'; answer[0] = 'false'; answer[1] = 'false'; answer[2] = 'false'; answer[3] = 'true'; answer[4] = 'false'; explain[0] = '#1

Identities do not replace trig ratios with constants. Identities replace trig ratios with other trig ratios that may be easier to simplify.

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Identities are only used when the given trig ratio is not usable in the problem. You should not use Identities with every trig problem. Identities should only be used if needed.

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sin(x) = cos(90 degrees - x)

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Identities can be used to find exact values for specific numbers, by replacing ratio with 2 or more that are ratios you have exact values for already.

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While Identites can be used to find exact values for many numbers, you can not replace all numbers with the proper trig ratios to find exact values. If you don't replace the number with ratios that we already have exact values for, it is not possible to get any more accurate by using identites.

"; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; //-->