      QED Solver for iPhone
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• "This is an app that I can recommend based on the ease of use and the appealing nature of the GUI."
- ReviewMe, March 13, 2012

Get QED Solver for iPhone: # QED Solver for iPhone: your calculations, on the go

## With QED Solver you can:

• Solve a wide variety of math problems - no calculation is too big or small.
• Plot beautiful charts. Solution reports are automatically generated for every solved problem.
• Enter your calculation with ease. We've made the syntax as close to natural language as possible and augmented the standard keyboard with the keys you'll need to quickly enter your problems..
• Create professional solution reports. Solution reports are automatically generated for every solved problem.
• Share your problem or solutions. Share them via email or print using an AirPrint compatible printer.
• Create your own functions with ease. Creating your own functions provides an efficient way of making your problem both compact and elegant. # Student Problems

// Simple Linear Equations

2x + y + z = 7 // Equation 1
x - y + z = 2 // Equation 2
x + y - z = 0 // Equation 3

// A simple function plot, the chart will automatically scale to the optimal size

plot sin(x)/x

// Alternatively, you can customze the chart with a wide variety of options

plot sin(x)/x,
charttitle="The Chart Title", // chart title
xlabel="x label", // X-axis label
ylabel="y label", // Y-axis label
xrange=0..10,
transparency=0.5,
thickness=2,
cos(x)/x,
seriesname="another series name",
transparency=0.5,
thickness=2

// A finance problem with several equations

A = 1000 // \$ initial capital
r = 1.10 // annual growth rate of 10%
Afinal = 10000 // \$ final capital
Afinal = A * r^N // N is number of years to achieve Afinal capital and will be solved for automatically

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# Engineering Problems

// Coupled Nonlinear Equations

β / λ = 1 / (1 + exp(β) + exp() + exp(-β^2))

λ * β = 1 / (1 + λ^β)

β > 0
λ > 0

// User Defined Functions (Single & Multi-Line)

f(x) := // Function f is multi-line
{
// Variables a, b, y are local to the function if not defined previously
a = 1 // Line 1
b = 2 // Line 2
y = a + b * x // Line 3
result = y * y
// Multi-line functions must always return a result

}

g(x) := sin(x) / (1 + |x|) // Single line function

// Using user defined functions
y = f(2)
z = g(5)

λ = g(1 + f(z)) // A function parameter may be an expression

// Numerical Integration & Differentiation

// Function to integrate, symmetrical around x = 0
g(x) := exp(-x^2)

// Numerical integral of g(x) from 0 to t

f(t) := integ(g(x),x,0,t)

a = deriv(f(x),x,1)
a_true = g(1)

b = deriv(f(x),x,2)
b_true = g(2)

c = deriv(f(x),x,3)
c_true = g(3)

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