gg's profile - activity

Sorry, I didn't take a screenshot. But admins can look at the logs.

Thanks for the reply. BTW, I was trying to post this question since yesterday, but it was being flagged as spam. Why is that? I am not behind proxy or anything.

I'm trying to solve the following trig eqn using sage.

$$sin(x)-cos(x) = 0$$

Hand calculation give me the result of: $$x=\frac{\pi}{4} + n\pi$$

However, the solve() function gives me a different result, why is that?:

sage: 
sage: solve(sin(x)-cos(x) == 0, x, to_poly_solve=True)
[x == 1/4*pi + pi*z25]
sage:

Also, what's z in the answer? I haven't defined any such variable.

How can I calculate twos and ones complement in sage?

I tried searching the docs but didn't find anything.

Thanks, I didn't notice it.

but the answer doesn't contain the last part (2, 6)

How to solve the following quadratic inequality:

$$0.3 < \frac{2x}{x^{2} + 4} <0.5$$

The call to solve function return the following output:

sage: 
sage: solve( [(2*x / (4+x**2)) < .5 , (2*x / (x**2 + 4)) > .3 ], x, to_poly_serve=True )
[[-2*x/(x^2 + 4) + 0.5 > 0, 2*x/(x^2 + 4) - 0.3 > 0]]
sage:

By hand calculation I found the following answer $(2/3, 2) \cup (2, 6)$.

So, its a function to plot relations rather than function. Thanks

what's the difference between plot and implicit_plot?

How you arrive at this function sgn(x)*abs(x)^(1/3)?

Specifying these arguments still doesn't plot the correct graph.

I was expecting this

sage: plot(x**(1/3))

This command produces a graph that looks like this:

I was expecting a graph like this:

BTW, I don't quite understand the term "complex plane" and how the square root converges to 0. Where I can read more about it?