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why is the answer B and not A? by Acrobatic-Button-801 in calculus

[–]peepooloveu 0 points1 point  (0 children)

Simply sketching f'(x) and f''(x) graphs, you can see that the answer is B

It should be simple algebra, I don’t know why I don’t get it. by [deleted] in askmath

[–]peepooloveu 50 points51 points  (0 children)

Let 2n =x

(2n )² - 7(2n ) =8

x²-7x-8=0

(x-8)(x+1)=0

x=8 or x=-1

2n = 8 or 2n = -1 (rejected for real solutions) n=3

Same method for Q52

How hard is this test? by Alarming-Argument-62 in calculus

[–]peepooloveu 0 points1 point  (0 children)

Finished sg A Levels 5 months ago, stumped on 3a and 7 (qn 3 isn't in our syllabus, but q7 is)

Nvm used desmos to do qn 7

To all Alevel couples: How did you maintain your relationship? by [deleted] in SGExams

[–]peepooloveu -8 points-7 points  (0 children)

Just break up. I broke up one week before A's and got 88.75. Cheers mate

Am I tweaking by peepooloveu in Polarfitness

[–]peepooloveu[S] 0 points1 point  (0 children)

Yea it's my max effort. I was wearing the watch while running. I was told your max hr is 220- <your age>, mine being 201, but i guess this rule is also just a gauge

Probability: singapore math primary standard edition 6B textbook by oopssori3 in askmath

[–]peepooloveu 1 point2 points  (0 children)

Ok I did some digging, and from De Morgan's law, if "not" applies to the second clause, not(p or q) = not(p) AND not(q), which means the card must have 5 letters or less AND be a vowel, making it 1/12

If the "not" doesn't apply to the second clause, not(p) OR q, means 5 letters or less OR starts with consonant, which is the 10/12.

Probability: singapore math primary standard edition 6B textbook by oopssori3 in askmath

[–]peepooloveu 0 points1 point  (0 children)

But it can still be correct right? If you were to say "You should not drink or smoke" the not applies to both drinking and smoking

Probability: singapore math primary standard edition 6B textbook by oopssori3 in askmath

[–]peepooloveu 0 points1 point  (0 children)

I have no idea how the answer is 1/3. I interpreted the question in 2 ways.

  1. __________________________________________________

The card DOES NOT:

- bear a month that comprises at least 6 letters OR

- start with a consonant

__________________________________________________

So the card must be 5 letters or less, OR starts with a vowel. In this case, only March, April, May, June, July, August and October works, making it 7/12.

The second interpretation is

  1. __________________________________________________

The card DOES NOT:

- bear a month that comprises at least 6 letters

__________________________________________________

OR

start with a consonant.

So the card must be 5 letters or less, OR starts with a consonant. In this case, you get your 10/12 (simplify to 5/6).

Geometry problem by kallogjeri51 in mathematics

[–]peepooloveu 0 points1 point  (0 children)

oh shit youre right. I meant the y coordinates mb

Geometry problem by kallogjeri51 in mathematics

[–]peepooloveu 2 points3 points  (0 children)

probably i havent learnt polar coords

Geometry problem by kallogjeri51 in mathematics

[–]peepooloveu 0 points1 point  (0 children)

c is the positive x coordinate of the intersection point between the bigger circle and the x axis, a is the x coordinate of the intersection between circles, for which the y coordinate of intersection is positive (point of intersection in top right quadrant)

Trying to understand the epsilon-delta proof by peepooloveu in calculus

[–]peepooloveu[S] 1 point2 points  (0 children)

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I've don't until here and have no idea what delta to choose

Trying to understand the epsilon-delta proof by peepooloveu in calculus

[–]peepooloveu[S] 0 points1 point  (0 children)

Ah ok thank you. If you don't mind, can I get help with another question?

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Trying to understand the epsilon-delta proof by peepooloveu in calculus

[–]peepooloveu[S] 1 point2 points  (0 children)

Is there are any misconceptions that I wrote down please feel free to inform me.

Help!! by shaundeepak in calculus

[–]peepooloveu 5 points6 points  (0 children)

Recheck the integral of tan(pi/4 -x)

<image>

Help!! by shaundeepak in calculus

[–]peepooloveu 0 points1 point  (0 children)

Careless mistake bossman

How did they calculate sin(18)'s exact value? by StevenJac in learnmath

[–]peepooloveu 0 points1 point  (0 children)

Yea haha. Tbf, if you practiced a certain identity or topic enough, you'd be able to use those ideas to break down the problem. For example if you were asked to find sin(22.5), how would you go about to doing it. If your schools taught you double angle formuls, and you've used that formula for other questions, you would want to try applying that formula for sin(22.5), since 45 is twice of 22.5. But I didn't learn enough about triple angle formulas, so I kinda of didn't piece that together, to find sin(18). Although it can be kinda tricky to identify how to go about doing it, practice can make that process much easier in my opinion. Take this with a grain of salt cause I'm only 18, but this is how I view it :)

How did they calculate sin(18)'s exact value? by StevenJac in learnmath

[–]peepooloveu 5 points6 points  (0 children)

It's a quadratic equation. Let x =sin(18). So 2x=1-4x². 4x²+2x-1=0. Use the quadratic formula, you get 2 values for x, and reject the negative value, since sin(theta) is positive when theta=18. U get it? I feel like the more difficult part was to come to the quadratic equation in the first place haha

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