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Dec
18
comment How to find where a function is increasing at the greatest rate
"...so it is a maxima" - what is it in this statement? (And it should just be called a maximum, singular)
Dec
12
comment Non-simultaneous intersections of $r = 4\cos\theta+1$ and $r = 2\cos\theta+1$
You replaced $\theta$ with $\pi + \theta$?? I don't think that's right
Dec
11
answered Distance between point and line in point slope form on a plane
Dec
11
comment Non-simultaneous intersections of $r = 4\cos\theta+1$ and $r = 2\cos\theta+1$
You didn't do the replacement, did you?
Dec
11
comment function has no inflection point but second derivative =0
This is a great opportunity to make use of test points. What happens immediately to the left/right of a zero of the second derivative?
Dec
10
comment Factor $14x^2 - 17x + 5$.
That is quite the post script!
Dec
7
comment Function $f: \mathbb{R} \to \mathbb{R}$ that takes each value in $\mathbb{R}$ three times
Right - couldn't we just take three lines, if we are able to restrict the domain?
Dec
3
answered Proof of trignometric identity
Dec
3
comment How is $-16/4i$ equal to $4i$?
My TI-83 evaluates the expression as $-4i$
Nov
24
comment Probability. 100 questions with 4 answers.
As far as I can tell, the fact that there are 100 questions only serves to confuse you. It is not necessary for the solution, or relevant to the calculation of the probability of getting one answer correct.
Nov
24
comment Rewrite the equation of a conic in cartesian coordinates
You didn't complete the square, did you?
Nov
16
comment The time derivative of any solution to the wave equation is also a solution
Do you know the wave equation?
Nov
14
comment In how many ways can two different prizes be given to ten students?
Why must a single student get both prizes? You should just be thinking about the number of ways that this can work out. Label the students A B C D E F G H I J. In case (i), the possibilities are AA AB AC AD AE AF AG AH AI AJ BA BB BC BD BE BF... can you figure out a way to count these?
Nov
13
comment High School Math: Lines and Angles
Draw a triangle.
Nov
13
comment High School Math: Lines and Angles
If the lines are parallel, then the sum of these angles is 180 degrees. Since these lines cross, the sum of these angles is [greater than or less than??] 180 degrees. So $5x > 180$... you should be able to determine that three times a positive number is greater than two times a positive number.
Nov
13
comment Inverse Trigonometry Problem
Where are you getting this information? The number I transcribed above was from google.
Nov
13
comment Inverse Trigonometry Problem
Yeah... not sure where you're going with this. Are we to then take the cosine of 53 degrees? Because that's $0.601815023...$
Nov
13
comment Inverse Trigonometry Problem
Draw a triangle in the standard position (first quadrant, start from the x-axis, etc). The sine (opp/hyp) is 4/5, so label the opposite $4$ and the hypotenuse $5$. The adjacent side is $3$, by the Pythagorean theorem. Then take the cosine of the angle.
Nov
13
comment Convergence of the series $\sum\limits_{n = 4}^\infty {\frac{{n + 1}}{{(n + 5)(n + 4)(n - 3)}}}$?
It does, and don't call me Shirley.
Nov
12
comment Proof by definition limit equals to infinity
You show that the right-handed limit is infinity, while the left-handed limit is something else (viz. negative infinity).