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How do I find the n-root of a number?

You can do it symbolically or numerically.

fricas
nthRoot(4, 7)
 (1)
Type: AlgebraicNumber?
fricas
nthRoot(4.0, 7)
 (2)
Type: Float

How do I solve inequalites?

FriCAS lacks support for this.

How do I find the angle in a scalar product? Degrees and radians.

Homework! Program the mathematical formula and you are done.

Is it possible to find the logarithm with base 10, 2 and 3 etc?

In FriCAS log denotes the natural logarithm and %e denotes exp(1).

fricas
log %e
 (3)
Type: Expression(Integer)

The lenght of a vector?

Just enter the formula.

fricas
v := vector [1,3,-5]
 (4)
Type: Vector(Integer)
fricas
len := sqrt dot(v,v)
 (5)
Type: AlgebraicNumber?

How can I rewrite a expression to with respect to a variable? For example v=H*r and to make axiom rewrite this as r=H/r?

Solve for it.

fricas
)clear prop v
solve(v=H*r, r)
 (6)
Type: List(Equation(Fraction(Polynomial(Integer))))

And I guess lcm is defined for only 2 numbers and not 3?

You can compute the lcm of a list of values.

fricas
lst := [n for n in 1..10]
 (7)
Type: List(PositiveInteger?)
fricas
lcm lst
 (8)
Type: PositiveInteger?

I realize that this is a lot of questions, so it is completely okay if you answer each questions short. I have tried a lot on my own, but need hints to understand the whole picture. I will also try to understand the coding of the programme afterwards:)It took me a short time to become natural with the programme, so thanks a lot!

 Subject:   Be Bold !! ( 15 subscribers )