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Section I: Multiple Choice (1 Viewer)

DanS

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Great. All right, I think, except for 2. I changed it from B to C, DON'T ASK. If only we didn't have a 15min blackout halfway thru...

a
c
d
c
b
d
c
c
a
d
 

cafe_pink

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question 7 is b since tan(pi/2) doesn't exist if you sub it back into the equation
 

vaimvaelk

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tanx -2 has 2 solutions in 2nd and 4th quadrant while sinx only has one answer pi/2 therefore 3
There are actually only 2 solutions, since when you sub pi/2 into the equation, you get no solution. This is because tan(pi/2) does not exist (sub tan(pi/2) in your calculator and you will get math error).
 

onlyhereforestiamte

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Why do you need to tan (pi/2)? It was just inverse tan -2, which has two solutions
plus 1 solution for sine (pi/2)

Tan(pi/2) is undefined though, the tan curve
you get the pi/2 from the (sinx - 1) bracket, but in the end it doesnt matter since its undefined in the tan curve
oh well woops my bad LOL didnt bother checking like i usually do ^_^
 

Chocolatebubble

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There are actually only 2 solutions, since when you sub pi/2 into the equation, you get no solution. This is because tan(pi/2) does not exist (sub tan(pi/2) in your calculator and you will get math error).
9/10 my streak has ended :(

funny story, I originally thought tan had no solutions and sin had 2 so b was going to be my answer. and i realise i'm wrong with both my assumptions

yis im gud at meth
 

photastic

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9/10 my streak has ended :(

funny story, I originally thought tan had no solutions and sin had 2 so b was going to be my answer. and i realise i'm wrong with both my assumptions

yis im gud at meth
But wolfram alpha says 3 solutions. If not, draw the diagram between 0 and 2pie and you will see 3 roots.
 

EdwardHeartsU

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A
B
D
C
D
D
B
C
A
D

Not sure how I went, I think I got 8 or 9..I was unsure about question 5 and 6.
 

trungduong12

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Some ppl got D for q5
XD

And everyone argues about q7 :/


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chrisdelinet

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But wolfram alpha says 3 solutions. If not, draw the diagram between 0 and 2pie and you will see 3 roots.
well if you were to draw the graph you'll plug in pi/2, you get an undefined y value. therefore i presumed those straight line sections are in fact asymptotes. therefore thats why i put 2 solutions.... quite worried for this as it is one of the two marks that are ambiguous with me.
 

chrisdelinet

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If 7 is C then i lost 2 marks for MC
if 7 is B then GG another mark gone :/




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problem is it all rides on this one and another answer (depending if they can read my writing) that will determine if i get 97-98 or 98-99, hopefully 7 is b and im in a real chance to get state rank
 

photastic

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well if you were to draw the graph you'll plug in pi/2, you get an undefined y value. therefore i presumed those straight line sections are in fact asymptotes. therefore thats why i put 2 solutions.... quite worried for this as it is one of the two marks that are ambiguous with me.
The picture clearly shows 3 x intercepts, between 0 and 2pie, hence 3 solutions.

 

chrisdelinet

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for fuck sakes, i did not see that coming, that nails the bloody cover on the coffin, it must be 3...

i put 3 initially but then was like tanpi/2 is undefined, i freaking hate multiple choice now.
 

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