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Browse High School Calculus
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Chain rule.
    Maximizing the volume of a box.
    Maximizing the volume of a cylinder.
    Volume of a tank.
    What is a derivative?

Partial Derivatives [03/24/2001]
What sense do partial derivatives make in the case where u is given as a function of two variables, say x and y...?

Partial Fractions [06/08/1997]
How do you break 1/x^2*(x+2) into partial fractions?

Partial Fractions [11/23/2003]
I need to put this fraction into power series formation: (3x^2 - x)/(x^3 - x^2 - x + 1). I've tried to use partial fractions but keep getting stuck.

Percentage of Numbers Divisible by 6, 8 [03/18/2003]
What percentage of numbers is divisible by 6? by 8?

Permutation and Combination Equality [07/18/1999]
Prove that (nC0)^2 + (nC1)^2 + (nC2)^2 + ... + (nCn)^2 = (2nCn), where nCi = n!/((n-i)!*i!).

Picard's Method [08/10/1997]
Can you tell me about Picard's iteration method of solving differential equations?

Plane Flying Parametrically [06/28/1999]
How can I find out when a plane, whose position approaching an airport is described parametrically by P_t = (1000,500,900)+ t[-100,-50,-90], will be closest to the traffic control center, located at (24,11,13)?

Point of Inflection [05/17/1997]
The cubic polynomial h(x) = x^3 - 3bx^2 + 3cx + d has a local maximum and a local minimum...

Point on a Parabola [1/9/1995]
How do you find the point on the parabola y = x^2 nearest the point (- 3,0)?

Points of Intersection [08/31/1997]
Estimate all points of intersection of the graphs f(x) = x + sin x and g(x) = x^3 by using a calculator or computer. How do you know you have found them all?

Polar Coordinates [11/4/1996]
Find the polar equation of x^3+y^3=3axy with x+y+a=0 as an asymptote.

Polar Coordinates for Velocity and Acceleration of a Particle [03/11/1997]
I know that velocity components are dr/dt and rdo/dt and that components of acceleration are d^2r/dt^2 - r(do/dt)^2, etc. I would appreciate any help at all in understanding how these are generated and/or how to use them.

Position Function of a Moving Particle [9/9/1996]
A particle moves on a straight line with a velocity v(t)=sin(w)cos^2w; f(0)=0; w is constant; find f(t).

Possible Proof That 1 + 1 Does Not Equal 2 [04/19/2001]
I just want verification... would this proof work?

Power Series for Sine and Cosine [10/12/2000]
Can you explain, without using calculus, how to get the power series for sine and cosine?

Pre-calculus Function Question [2/8/1996]
Does the function f(x)=3De^(1/x) have a local minimum?

Primitive function [6/11/1996]
Give a primitive function of (sin x) / (ln (2 + x^2)).

Projectile Velocity and Vectors [5/7/1996]
If the initial velocity is 834 meter^2/sec at an angle of 60 degrees, and x is 21,000, at what time, t, is the object at x = 21000 meters?

Proof by First Principles [11/16/2001]
How can I prove by first principles that the derivative of tan(x) is sec^2(x)?

Proof for the Radius of Curvature [08/17/2003]
The equation of a circle of radius R centered at the origin is x^2+y^2 = R^2. Demonstrate that the radius of curvature is equal to R.

Proof of a Bounded Series using the Binomial Theorem [6/6/1995]
Prove that (1+1/n)^n is bounded from above.

Proof of Absolute Value, Division [7/16/1996]
If y does not equal to 0, prove that |x / y| = |x|/|y|.

Proof of Cosine of 36 Degrees [11/26/2001]
Prove: cosine {(pi)/5} = {1+5^(1/2)}/4.

Proof of Derivative for Function f(x) = ax^n [01/14/2004]
Is there a way to prove or show why the derivative of ax^n turns out to be anx^(n-1)?

Proof of Integration by Parts [02/06/2001]
How do you derive the formula for integration by parts?

Proof of Series ln(1+x) [11/15/2001]
I need to show that the series ln(1+x) equals x-x^2/2+x^3/3-x^4/4, and so on, whenever x is between -1 and 1.

Proof of Stirling's Approximation [03/09/2006]
Can you prove that lim ((e^n)(n!)) / ((n^n)(n)^1/2 = (2pi)^1/2 ?

Proof of Tangent Double Angle Identity [7/16/1996]
I would like to see the proof of the tangent double angle identity.

Proof of the Chain Rule [09/06/2004]
I am using the Chain Rule (dy/dx = dy/du * du/dx) in my math class, and I would like to see it proved, which we don't do in class.

Proofs of e [03/21/2002]
I found out that the definition of e is: e = lim, as n approaches infinity (1+1/n)^n. Is there a proof for this or for 1+2(e-1/n)?

Proof that 2 Equals 1 Using Derivatives [05/10/2000]
If d(x^2)/dx = d(x+x+...+x)/dx, then 2x = 1+1+...+1 = x. What is the error in this "proof"?

Proof that INT(1/x)dx = lnx [11/08/1996]
How do you integrate (1/x)dx?

Proving Limits at Infinity Using the Formal Definition [04/11/2004]
We are required to find a limit (informally), then prove that our answer is correct by using the formal definition of limits. I'm not sure I'm on the right track.

Proving Limits Formally [01/04/1999]
Given a sequence, I can guess what the limit it. How do I actually prove my guess is the limit?

Proving That d(e^x)/dx = e^x [06/30/1999]
How can I find the derivative of y = e^x, using the definition of the derivative?

Proving the Derivative of e^x Is e^x [02/20/2006]
What is the delta x proof of (dy/dx)e^x = e^x?

Ptolemy's Theorem and Double-angle Formulas [7/11/1996]
Is it possible to show the formula Sin(A-B), Cos(A+B) or Cos(A-B) using Ptolemy's Theorem?

Quadratic Extrema [07/20/2002]
Can you tell me how to find the minimum or maximum of a quadratic function?

Quadratic Function and Diagonals of a Diamond [6/14/1996]
The sum of the two lozenges (diagonals of a diamond) are maximum when the angle between the longest lozenge and the side of the diamond is 30 degrees, diamond side length = sqrt 2...

Quotient Function Mnemonic [03/11/2002]
Help me to differentiate the following: x/((x^2)-4).

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