# Items tagged with trigonometrytrigonometry Tagged Items Feed

### Why is my trig failing to compute? ...

February 08 2015
0 4

So it looks like radians work.

Why does degrees fail and how do I get degrees work?

How do you guys like to access pi? Do you keep a symbol of it around in a random document to open?

http://i.imgur.com/07o1dyH.png

### isosceles right triangle...

February 07 2015
0 2

Let A(x , 2 , -1) ,B(0, y , 1) ,C(3 , 4 , -2) , AB=AC and ABC is isosceles right triangle. Find x and y ?

### How do I resolve "extra unknowns"?...

February 05 2015
1 2

I am attempting to plot an initial value problem in Maple 18.  I have my equation defined, as well as a general solution and two particular solutions at y(0)=3/4 and y(0)=1/2.  To graph, I entered the command

DEplot(de,y(x),x=-3..3,{[0,1/2],[0,3/4]},dirgrid=[12,12],color=black,linecolor=blue,thickness=2);

but instead of returning a graph, the software gave me the error message

Error, (in DEtools/DEplot/CheckDE) extra unknowns found: sinx

The Maple support site lists this as an unknown error, and as a new user, I'm not sure what to do.  What does this mean?

### Simplify z+conjugate(z) with constraint of the str...

December 21 2014
0 1

Hello

I have this kind of expression :

I would like to keep a sum like and simplify all the expressions of
the type $z+\bar{z}=2Re(Z)$

### Trigonometry and cosine...

December 01 2014
0 4

True of False, Explain:

If ∏/2<θ<∏, Then cos θ/2<0

### Trigonometric ...

October 31 2013
0 3

Find the value: P=sin(10)sin(30)sin(50)...sin(890) ?

### Converting trigonometric functions...

October 30 2013
2 8

How do you express sin(4x)^2 in terms of powers of cos(x) in Maple 17?

### How to use double angle formula in Maple? (NOT HAL...

October 17 2013
1 14

My question is in the title, here is simple example:

K:=(sin^2(a+b)-sin^2(a-b))

I use formula of abridged multiplication (with help of "factor")

>factor(K)

(sin(a+b) - sin(a-b))(sin(a+b) + sin(a-b))

Then expand:

>expand(%, trig)

4sin(a)cos(b)cos(a)sin(b)

And all I whant now is to use double angle formula like this:

4sin(a)cos(b)cos(a)sin(b) = sin(2a)sin(2b)

### Problem with Trigonometric Equation...

August 23 2013
1 2

I am trying to use the procedure described in the answers to this question:

http://www.mapleprimes.com/questions/100137-Solving-Trigonometric-Equations-For

to find the solutions to sin(2*x) = 1/2 where -2*Pi <= x <= 2*Pi. After the isolve() command is issued, I get the warning that solutions may have been lost. i think the issue is the form in which Maple represents the general solution to the equation. Any ideas on how to rectify this would be greatly appreciated!

### calculating a sum symbolically...

January 12 2013
2
8

Dear friends,

I have recently been calculating a sum from this link.

The problem here is to calculate the sum sum_{n>=1} (-1)^(n+1)/(n^2+a) with a some positive real number. You probably all agree that it is preferable to express it using elementary functions from basic calculus as opposed to the Gamma, Zeta and Digamma...

### How to solve it with Maple?...

November 26 2012
0 6

 How to solve it with Maple? The explicit and nonnumerical solution is required.

### Tangent line to a circle through an external point...

November 20 2012
0 4

The circle S with center at the origin and radius 2 is given by the equation x2 + y2 = 4
The circle S have two

### Equation with trignometry...

September 16 2012
0 2

Dear All,

maplehelp.mw

I am trying to solve the equation shown in the attached file but can't get the required answer, any suggestions?

I shall be very thankful.

Regards

A.Q

A(n,q) = I(n)*Z(q)/2 * Sum((cos(nwt - qptheta - (n-q)(i-1)2*Pi/3)+cos(nwt + qptheta - (n+q)(i-1)2*Pi/3)),i=1..3)

With n - q = ...-9,-6,-3,0,3,6,9   above equation becomes

### trigonometry problem...

July 29 2012
0 2

Mapletrighelp.mw

Hi all,

I am calculating the following :

Fa:=(Fa1*cos(wt))*cos(theta)

Fb:=(Fa1*cos(wt-120))*cos(theta-120)

Fc:=(Fa1*cos(wt-240))*cos(theta-240)

Ftotal:=Fa+Fb+Fc

Ftotal:= Fa1*1/2(3*cos(wt-theta)+cos(wt+theta)+cos(wt+theta-240)+cos(wt+theta-480))

Problem:

The exact solution I am looking for is: Ftotal:=3/2*Fa1*cos(wt-theta...

### Trigonometric Simplification...

May 08 2012
1 10

Greetingsi

Maple does not simplify the expression -2*Pi*sin(Pi*a)/(-1+cos(2*Pi*a)). How can I make it do so?

Thanks,

Maple 15 64-bit on Windows 7

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