# PracticeApproximate Trig Values 1

#### puremath

##### New member
Approximate the given trigonometric values to within successive tenths. Then use a calculator to compute the values to the nearest hundredth.

cos 2 and sin 2

#### MarkFL

##### La Villa Strangiato
Math Helper
What method are you instructed to use for the approximations? I would be inclined to use truncations of the following series:

[MATH]\sin(x)=\sum_{k=0}^{\infty}\frac{(-1)^k}{(2k+1)!}x^{2k+1}[/MATH]
[MATH]\cos(x)=\sum_{k=0}^{\infty}\frac{(-1)^k}{(2k)!}x^{2k}[/MATH]

#### puremath

##### New member
What method are you instructed to use for the approximations? I would be inclined to use truncations of the following series:

[MATH]\sin(x)=\sum_{k=0}^{\infty}\frac{(-1)^k}{(2k+1)!}x^{2k+1}[/MATH]
[MATH]\cos(x)=\sum_{k=0}^{\infty}\frac{(-1)^k}{(2k)!}x^{2k}[/MATH]

1. Cohen did not enclose the arguments in parentheses.

2. There is a picture to be used with this question(s).

3. In terms of radians or degrees, I have to check the textbook again.

#### MarkFL

##### La Villa Strangiato
Math Helper
Why are you posting the same post over and over?

#### puremath

##### New member
Why are you posting the same post over and over?

I want you to know what is going on at my end.

#### MarkFL

##### La Villa Strangiato
Math Helper
I don't need it multiple times. One time, and I've got it. #### puremath

##### New member
I don't need it multiple times. One time, and I've got it. I could not upload the given circle picture here. So, we will skip all Approximate Trig Values threads.

#### MarkFL

##### La Villa Strangiato
Math Helper
Sorry, the huge images were taking up too much server space, and I had to revert the maximum allowed settings back to the default. You could use something like Imgur to host the images, and then hotlink to them here.

#### puremath

##### New member
Sorry, the huge images were taking up too much server space, and I had to revert the maximum allowed settings back to the default. You could use something like Imgur to host the images, and then hotlink to them here.

I do not know anything about Imgur.

#### MarkFL

##### La Villa Strangiato
Math Helper
I help admin a general chat forum where lots of the members use smartphones and they seem to indicate it's pretty easy to use.

#### puremath

##### New member
I help admin a general chat forum where lots of the members use smartphones and they seem to indicate it's pretty easy to use.

#### MarkFL

##### La Villa Strangiato
Math Helper
I don't use it myself, as I have no need for it, but you should be able to google it, etc.

#### puremath

##### New member
I don't use it myself, as I have no need for it, but you should be able to google it, etc.

Let me see what I do. There are too many questions throughout the Cohen textbook where using a geometric figure is needed.