# PracticeApproximate Trig Values 2

#### 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
After completing the previous problem, I would then use the following identities:

[MATH]\sin(-x)=-\sin(x)[/MATH]
[MATH]\cos(-x)=\cos(x)[/MATH]
These come directly from the odd symmetry of the sine function, and the even symmetry of the cosine function.

#### puremath

##### New member
After completing the previous problem, I would then use the following identities:

[MATH]\sin(-x)=-\sin(x)[/MATH]
[MATH]\cos(-x)=\cos(x)[/MATH]
These come directly from the odd symmetry of the sine function, and the even symmetry of the cosine function.

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.

Math Helper
Ugh...